type of research design quantitative

Have a language expert improve your writing

Run a free plagiarism check in 10 minutes, automatically generate references for free.

• Knowledge Base
• Methodology

Research Design | Step-by-Step Guide with Examples

Published on 5 May 2022 by Shona McCombes . Revised on 20 March 2023.

A research design is a strategy for answering your research question  using empirical data. Creating a research design means making decisions about:

• Your overall aims and approach
• The type of research design you’ll use
• Your sampling methods or criteria for selecting subjects
• Your data collection methods
• The procedures you’ll follow to collect data
• Your data analysis methods

A well-planned research design helps ensure that your methods match your research aims and that you use the right kind of analysis for your data.

Table of contents

Step 1: consider your aims and approach, step 2: choose a type of research design, step 3: identify your population and sampling method, step 4: choose your data collection methods, step 5: plan your data collection procedures, step 6: decide on your data analysis strategies, frequently asked questions.

• Introduction

Before you can start designing your research, you should already have a clear idea of the research question you want to investigate.

There are many different ways you could go about answering this question. Your research design choices should be driven by your aims and priorities – start by thinking carefully about what you want to achieve.

The first choice you need to make is whether you’ll take a qualitative or quantitative approach.

Qualitative research designs tend to be more flexible and inductive , allowing you to adjust your approach based on what you find throughout the research process.

Quantitative research designs tend to be more fixed and deductive , with variables and hypotheses clearly defined in advance of data collection.

It’s also possible to use a mixed methods design that integrates aspects of both approaches. By combining qualitative and quantitative insights, you can gain a more complete picture of the problem you’re studying and strengthen the credibility of your conclusions.

Practical and ethical considerations when designing research

As well as scientific considerations, you need to think practically when designing your research. If your research involves people or animals, you also need to consider research ethics .

• How much time do you have to collect data and write up the research?
• Will you be able to gain access to the data you need (e.g., by travelling to a specific location or contacting specific people)?
• Do you have the necessary research skills (e.g., statistical analysis or interview techniques)?
• Will you need ethical approval ?

At each stage of the research design process, make sure that your choices are practically feasible.

Prevent plagiarism, run a free check.

Within both qualitative and quantitative approaches, there are several types of research design to choose from. Each type provides a framework for the overall shape of your research.

Types of quantitative research designs

Quantitative designs can be split into four main types. Experimental and   quasi-experimental designs allow you to test cause-and-effect relationships, while descriptive and correlational designs allow you to measure variables and describe relationships between them.

With descriptive and correlational designs, you can get a clear picture of characteristics, trends, and relationships as they exist in the real world. However, you can’t draw conclusions about cause and effect (because correlation doesn’t imply causation ).

Experiments are the strongest way to test cause-and-effect relationships without the risk of other variables influencing the results. However, their controlled conditions may not always reflect how things work in the real world. They’re often also more difficult and expensive to implement.

Types of qualitative research designs

Qualitative designs are less strictly defined. This approach is about gaining a rich, detailed understanding of a specific context or phenomenon, and you can often be more creative and flexible in designing your research.

The table below shows some common types of qualitative design. They often have similar approaches in terms of data collection, but focus on different aspects when analysing the data.

Your research design should clearly define who or what your research will focus on, and how you’ll go about choosing your participants or subjects.

In research, a population is the entire group that you want to draw conclusions about, while a sample is the smaller group of individuals you’ll actually collect data from.

Defining the population

A population can be made up of anything you want to study – plants, animals, organisations, texts, countries, etc. In the social sciences, it most often refers to a group of people.

For example, will you focus on people from a specific demographic, region, or background? Are you interested in people with a certain job or medical condition, or users of a particular product?

The more precisely you define your population, the easier it will be to gather a representative sample.

Sampling methods

Even with a narrowly defined population, it’s rarely possible to collect data from every individual. Instead, you’ll collect data from a sample.

To select a sample, there are two main approaches: probability sampling and non-probability sampling . The sampling method you use affects how confidently you can generalise your results to the population as a whole.

Probability sampling is the most statistically valid option, but it’s often difficult to achieve unless you’re dealing with a very small and accessible population.

For practical reasons, many studies use non-probability sampling, but it’s important to be aware of the limitations and carefully consider potential biases. You should always make an effort to gather a sample that’s as representative as possible of the population.

Case selection in qualitative research

In some types of qualitative designs, sampling may not be relevant.

For example, in an ethnography or a case study, your aim is to deeply understand a specific context, not to generalise to a population. Instead of sampling, you may simply aim to collect as much data as possible about the context you are studying.

In these types of design, you still have to carefully consider your choice of case or community. You should have a clear rationale for why this particular case is suitable for answering your research question.

For example, you might choose a case study that reveals an unusual or neglected aspect of your research problem, or you might choose several very similar or very different cases in order to compare them.

Data collection methods are ways of directly measuring variables and gathering information. They allow you to gain first-hand knowledge and original insights into your research problem.

You can choose just one data collection method, or use several methods in the same study.

Survey methods

Surveys allow you to collect data about opinions, behaviours, experiences, and characteristics by asking people directly. There are two main survey methods to choose from: questionnaires and interviews.

Observation methods

Observations allow you to collect data unobtrusively, observing characteristics, behaviours, or social interactions without relying on self-reporting.

Observations may be conducted in real time, taking notes as you observe, or you might make audiovisual recordings for later analysis. They can be qualitative or quantitative.

Other methods of data collection

There are many other ways you might collect data depending on your field and topic.

If you’re not sure which methods will work best for your research design, try reading some papers in your field to see what data collection methods they used.

Secondary data

If you don’t have the time or resources to collect data from the population you’re interested in, you can also choose to use secondary data that other researchers already collected – for example, datasets from government surveys or previous studies on your topic.

With this raw data, you can do your own analysis to answer new research questions that weren’t addressed by the original study.

Using secondary data can expand the scope of your research, as you may be able to access much larger and more varied samples than you could collect yourself.

However, it also means you don’t have any control over which variables to measure or how to measure them, so the conclusions you can draw may be limited.

As well as deciding on your methods, you need to plan exactly how you’ll use these methods to collect data that’s consistent, accurate, and unbiased.

Planning systematic procedures is especially important in quantitative research, where you need to precisely define your variables and ensure your measurements are reliable and valid.

Operationalisation

Some variables, like height or age, are easily measured. But often you’ll be dealing with more abstract concepts, like satisfaction, anxiety, or competence. Operationalisation means turning these fuzzy ideas into measurable indicators.

If you’re using observations , which events or actions will you count?

If you’re using surveys , which questions will you ask and what range of responses will be offered?

You may also choose to use or adapt existing materials designed to measure the concept you’re interested in – for example, questionnaires or inventories whose reliability and validity has already been established.

Reliability and validity

Reliability means your results can be consistently reproduced , while validity means that you’re actually measuring the concept you’re interested in.

For valid and reliable results, your measurement materials should be thoroughly researched and carefully designed. Plan your procedures to make sure you carry out the same steps in the same way for each participant.

If you’re developing a new questionnaire or other instrument to measure a specific concept, running a pilot study allows you to check its validity and reliability in advance.

Sampling procedures

As well as choosing an appropriate sampling method, you need a concrete plan for how you’ll actually contact and recruit your selected sample.

That means making decisions about things like:

• How many participants do you need for an adequate sample size?
• What inclusion and exclusion criteria will you use to identify eligible participants?
• How will you contact your sample – by mail, online, by phone, or in person?

If you’re using a probability sampling method, it’s important that everyone who is randomly selected actually participates in the study. How will you ensure a high response rate?

If you’re using a non-probability method, how will you avoid bias and ensure a representative sample?

Data management

It’s also important to create a data management plan for organising and storing your data.

Will you need to transcribe interviews or perform data entry for observations? You should anonymise and safeguard any sensitive data, and make sure it’s backed up regularly.

Keeping your data well organised will save time when it comes to analysing them. It can also help other researchers validate and add to your findings.

On their own, raw data can’t answer your research question. The last step of designing your research is planning how you’ll analyse the data.

Quantitative data analysis

In quantitative research, you’ll most likely use some form of statistical analysis . With statistics, you can summarise your sample data, make estimates, and test hypotheses.

Using descriptive statistics , you can summarise your sample data in terms of:

• The distribution of the data (e.g., the frequency of each score on a test)
• The central tendency of the data (e.g., the mean to describe the average score)
• The variability of the data (e.g., the standard deviation to describe how spread out the scores are)

The specific calculations you can do depend on the level of measurement of your variables.

Using inferential statistics , you can:

• Make estimates about the population based on your sample data.
• Test hypotheses about a relationship between variables.

Regression and correlation tests look for associations between two or more variables, while comparison tests (such as t tests and ANOVAs ) look for differences in the outcomes of different groups.

Your choice of statistical test depends on various aspects of your research design, including the types of variables you’re dealing with and the distribution of your data.

Qualitative data analysis

In qualitative research, your data will usually be very dense with information and ideas. Instead of summing it up in numbers, you’ll need to comb through the data in detail, interpret its meanings, identify patterns, and extract the parts that are most relevant to your research question.

Two of the most common approaches to doing this are thematic analysis and discourse analysis .

There are many other ways of analysing qualitative data depending on the aims of your research. To get a sense of potential approaches, try reading some qualitative research papers in your field.

A sample is a subset of individuals from a larger population. Sampling means selecting the group that you will actually collect data from in your research.

For example, if you are researching the opinions of students in your university, you could survey a sample of 100 students.

Statistical sampling allows you to test a hypothesis about the characteristics of a population. There are various sampling methods you can use to ensure that your sample is representative of the population as a whole.

Operationalisation means turning abstract conceptual ideas into measurable observations.

For example, the concept of social anxiety isn’t directly observable, but it can be operationally defined in terms of self-rating scores, behavioural avoidance of crowded places, or physical anxiety symptoms in social situations.

Before collecting data , it’s important to consider how you will operationalise the variables that you want to measure.

The research methods you use depend on the type of data you need to answer your research question .

• If you want to measure something or test a hypothesis , use quantitative methods . If you want to explore ideas, thoughts, and meanings, use qualitative methods .
• If you want to analyse a large amount of readily available data, use secondary data. If you want data specific to your purposes with control over how they are generated, collect primary data.
• If you want to establish cause-and-effect relationships between variables , use experimental methods. If you want to understand the characteristics of a research subject, use descriptive methods.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

McCombes, S. (2023, March 20). Research Design | Step-by-Step Guide with Examples. Scribbr. Retrieved 22 April 2024, from https://www.scribbr.co.uk/research-methods/research-design/

Is this article helpful?

Shona McCombes

Research Design 101

Everything You Need To Get Started (With Examples)

By: Derek Jansen (MBA) | Reviewers: Eunice Rautenbach (DTech) & Kerryn Warren (PhD) | April 2023

Navigating the world of research can be daunting, especially if you’re a first-time researcher. One concept you’re bound to run into fairly early in your research journey is that of “ research design ”. Here, we’ll guide you through the basics using practical examples , so that you can approach your research with confidence.

Overview: Research Design 101

What is research design.

• Research design types for quantitative studies
• Video explainer : quantitative research design
• Research design types for qualitative studies
• Video explainer : qualitative research design
• How to choose a research design
• Key takeaways

Research design refers to the overall plan, structure or strategy that guides a research project , from its conception to the final data analysis. A good research design serves as the blueprint for how you, as the researcher, will collect and analyse data while ensuring consistency, reliability and validity throughout your study.

Understanding different types of research designs is essential as helps ensure that your approach is suitable  given your research aims, objectives and questions , as well as the resources you have available to you. Without a clear big-picture view of how you’ll design your research, you run the risk of potentially making misaligned choices in terms of your methodology – especially your sampling , data collection and data analysis decisions.

The problem with defining research design…

One of the reasons students struggle with a clear definition of research design is because the term is used very loosely across the internet, and even within academia.

Some sources claim that the three research design types are qualitative, quantitative and mixed methods , which isn’t quite accurate (these just refer to the type of data that you’ll collect and analyse). Other sources state that research design refers to the sum of all your design choices, suggesting it’s more like a research methodology . Others run off on other less common tangents. No wonder there’s confusion!

In this article, we’ll clear up the confusion. We’ll explain the most common research design types for both qualitative and quantitative research projects, whether that is for a full dissertation or thesis, or a smaller research paper or article.

Research Design: Quantitative Studies

Quantitative research involves collecting and analysing data in a numerical form. Broadly speaking, there are four types of quantitative research designs: descriptive , correlational , experimental , and quasi-experimental . 

Descriptive Research Design

As the name suggests, descriptive research design focuses on describing existing conditions, behaviours, or characteristics by systematically gathering information without manipulating any variables. In other words, there is no intervention on the researcher’s part – only data collection.

For example, if you’re studying smartphone addiction among adolescents in your community, you could deploy a survey to a sample of teens asking them to rate their agreement with certain statements that relate to smartphone addiction. The collected data would then provide insight regarding how widespread the issue may be – in other words, it would describe the situation.

The key defining attribute of this type of research design is that it purely describes the situation . In other words, descriptive research design does not explore potential relationships between different variables or the causes that may underlie those relationships. Therefore, descriptive research is useful for generating insight into a research problem by describing its characteristics . By doing so, it can provide valuable insights and is often used as a precursor to other research design types.

Correlational Research Design

Correlational design is a popular choice for researchers aiming to identify and measure the relationship between two or more variables without manipulating them . In other words, this type of research design is useful when you want to know whether a change in one thing tends to be accompanied by a change in another thing.

For example, if you wanted to explore the relationship between exercise frequency and overall health, you could use a correlational design to help you achieve this. In this case, you might gather data on participants’ exercise habits, as well as records of their health indicators like blood pressure, heart rate, or body mass index. Thereafter, you’d use a statistical test to assess whether there’s a relationship between the two variables (exercise frequency and health).

As you can see, correlational research design is useful when you want to explore potential relationships between variables that cannot be manipulated or controlled for ethical, practical, or logistical reasons. It is particularly helpful in terms of developing predictions , and given that it doesn’t involve the manipulation of variables, it can be implemented at a large scale more easily than experimental designs (which will look at next).

That said, it’s important to keep in mind that correlational research design has limitations – most notably that it cannot be used to establish causality . In other words, correlation does not equal causation . To establish causality, you’ll need to move into the realm of experimental design, coming up next…

Need a helping hand?

Experimental Research Design

Experimental research design is used to determine if there is a causal relationship between two or more variables . With this type of research design, you, as the researcher, manipulate one variable (the independent variable) while controlling others (dependent variables). Doing so allows you to observe the effect of the former on the latter and draw conclusions about potential causality.

For example, if you wanted to measure if/how different types of fertiliser affect plant growth, you could set up several groups of plants, with each group receiving a different type of fertiliser, as well as one with no fertiliser at all. You could then measure how much each plant group grew (on average) over time and compare the results from the different groups to see which fertiliser was most effective.

Overall, experimental research design provides researchers with a powerful way to identify and measure causal relationships (and the direction of causality) between variables. However, developing a rigorous experimental design can be challenging as it’s not always easy to control all the variables in a study. This often results in smaller sample sizes , which can reduce the statistical power and generalisability of the results.

Moreover, experimental research design requires random assignment . This means that the researcher needs to assign participants to different groups or conditions in a way that each participant has an equal chance of being assigned to any group (note that this is not the same as random sampling ). Doing so helps reduce the potential for bias and confounding variables . This need for random assignment can lead to ethics-related issues . For example, withholding a potentially beneficial medical treatment from a control group may be considered unethical in certain situations.

Quasi-Experimental Research Design

Quasi-experimental research design is used when the research aims involve identifying causal relations , but one cannot (or doesn’t want to) randomly assign participants to different groups (for practical or ethical reasons). Instead, with a quasi-experimental research design, the researcher relies on existing groups or pre-existing conditions to form groups for comparison.

For example, if you were studying the effects of a new teaching method on student achievement in a particular school district, you may be unable to randomly assign students to either group and instead have to choose classes or schools that already use different teaching methods. This way, you still achieve separate groups, without having to assign participants to specific groups yourself.

Naturally, quasi-experimental research designs have limitations when compared to experimental designs. Given that participant assignment is not random, it’s more difficult to confidently establish causality between variables, and, as a researcher, you have less control over other variables that may impact findings.

All that said, quasi-experimental designs can still be valuable in research contexts where random assignment is not possible and can often be undertaken on a much larger scale than experimental research, thus increasing the statistical power of the results. What’s important is that you, as the researcher, understand the limitations of the design and conduct your quasi-experiment as rigorously as possible, paying careful attention to any potential confounding variables .

Research Design: Qualitative Studies

There are many different research design types when it comes to qualitative studies, but here we’ll narrow our focus to explore the “Big 4”. Specifically, we’ll look at phenomenological design, grounded theory design, ethnographic design, and case study design.

Phenomenological Research Design

Phenomenological design involves exploring the meaning of lived experiences and how they are perceived by individuals. This type of research design seeks to understand people’s perspectives , emotions, and behaviours in specific situations. Here, the aim for researchers is to uncover the essence of human experience without making any assumptions or imposing preconceived ideas on their subjects.

For example, you could adopt a phenomenological design to study why cancer survivors have such varied perceptions of their lives after overcoming their disease. This could be achieved by interviewing survivors and then analysing the data using a qualitative analysis method such as thematic analysis to identify commonalities and differences.

Phenomenological research design typically involves in-depth interviews or open-ended questionnaires to collect rich, detailed data about participants’ subjective experiences. This richness is one of the key strengths of phenomenological research design but, naturally, it also has limitations. These include potential biases in data collection and interpretation and the lack of generalisability of findings to broader populations.

Grounded Theory Research Design

Grounded theory (also referred to as “GT”) aims to develop theories by continuously and iteratively analysing and comparing data collected from a relatively large number of participants in a study. It takes an inductive (bottom-up) approach, with a focus on letting the data “speak for itself”, without being influenced by preexisting theories or the researcher’s preconceptions.

As an example, let’s assume your research aims involved understanding how people cope with chronic pain from a specific medical condition, with a view to developing a theory around this. In this case, grounded theory design would allow you to explore this concept thoroughly without preconceptions about what coping mechanisms might exist. You may find that some patients prefer cognitive-behavioural therapy (CBT) while others prefer to rely on herbal remedies. Based on multiple, iterative rounds of analysis, you could then develop a theory in this regard, derived directly from the data (as opposed to other preexisting theories and models).

Grounded theory typically involves collecting data through interviews or observations and then analysing it to identify patterns and themes that emerge from the data. These emerging ideas are then validated by collecting more data until a saturation point is reached (i.e., no new information can be squeezed from the data). From that base, a theory can then be developed .

As you can see, grounded theory is ideally suited to studies where the research aims involve theory generation , especially in under-researched areas. Keep in mind though that this type of research design can be quite time-intensive , given the need for multiple rounds of data collection and analysis.

Ethnographic Research Design

Ethnographic design involves observing and studying a culture-sharing group of people in their natural setting to gain insight into their behaviours, beliefs, and values. The focus here is on observing participants in their natural environment (as opposed to a controlled environment). This typically involves the researcher spending an extended period of time with the participants in their environment, carefully observing and taking field notes .

All of this is not to say that ethnographic research design relies purely on observation. On the contrary, this design typically also involves in-depth interviews to explore participants’ views, beliefs, etc. However, unobtrusive observation is a core component of the ethnographic approach.

As an example, an ethnographer may study how different communities celebrate traditional festivals or how individuals from different generations interact with technology differently. This may involve a lengthy period of observation, combined with in-depth interviews to further explore specific areas of interest that emerge as a result of the observations that the researcher has made.

As you can probably imagine, ethnographic research design has the ability to provide rich, contextually embedded insights into the socio-cultural dynamics of human behaviour within a natural, uncontrived setting. Naturally, however, it does come with its own set of challenges, including researcher bias (since the researcher can become quite immersed in the group), participant confidentiality and, predictably, ethical complexities . All of these need to be carefully managed if you choose to adopt this type of research design.

Case Study Design

With case study research design, you, as the researcher, investigate a single individual (or a single group of individuals) to gain an in-depth understanding of their experiences, behaviours or outcomes. Unlike other research designs that are aimed at larger sample sizes, case studies offer a deep dive into the specific circumstances surrounding a person, group of people, event or phenomenon, generally within a bounded setting or context .

As an example, a case study design could be used to explore the factors influencing the success of a specific small business. This would involve diving deeply into the organisation to explore and understand what makes it tick – from marketing to HR to finance. In terms of data collection, this could include interviews with staff and management, review of policy documents and financial statements, surveying customers, etc.

While the above example is focused squarely on one organisation, it’s worth noting that case study research designs can have different variation s, including single-case, multiple-case and longitudinal designs. As you can see in the example, a single-case design involves intensely examining a single entity to understand its unique characteristics and complexities. Conversely, in a multiple-case design , multiple cases are compared and contrasted to identify patterns and commonalities. Lastly, in a longitudinal case design , a single case or multiple cases are studied over an extended period of time to understand how factors develop over time.

As you can see, a case study research design is particularly useful where a deep and contextualised understanding of a specific phenomenon or issue is desired. However, this strength is also its weakness. In other words, you can’t generalise the findings from a case study to the broader population. So, keep this in mind if you’re considering going the case study route.

How To Choose A Research Design

Having worked through all of these potential research designs, you’d be forgiven for feeling a little overwhelmed and wondering, “ But how do I decide which research design to use? ”. While we could write an entire post covering that alone, here are a few factors to consider that will help you choose a suitable research design for your study.

Data type: The first determining factor is naturally the type of data you plan to be collecting – i.e., qualitative or quantitative. This may sound obvious, but we have to be clear about this – don’t try to use a quantitative research design on qualitative data (or vice versa)!

Research aim(s) and question(s): As with all methodological decisions, your research aim and research questions will heavily influence your research design. For example, if your research aims involve developing a theory from qualitative data, grounded theory would be a strong option. Similarly, if your research aims involve identifying and measuring relationships between variables, one of the experimental designs would likely be a better option.

Time: It’s essential that you consider any time constraints you have, as this will impact the type of research design you can choose. For example, if you’ve only got a month to complete your project, a lengthy design such as ethnography wouldn’t be a good fit.

Resources: Take into account the resources realistically available to you, as these need to factor into your research design choice. For example, if you require highly specialised lab equipment to execute an experimental design, you need to be sure that you’ll have access to that before you make a decision.

Keep in mind that when it comes to research, it’s important to manage your risks and play as conservatively as possible. If your entire project relies on you achieving a huge sample, having access to niche equipment or holding interviews with very difficult-to-reach participants, you’re creating risks that could kill your project. So, be sure to think through your choices carefully and make sure that you have backup plans for any existential risks. Remember that a relatively simple methodology executed well generally will typically earn better marks than a highly-complex methodology executed poorly.

Recap: Key Takeaways

We’ve covered a lot of ground here. Let’s recap by looking at the key takeaways:

• Research design refers to the overall plan, structure or strategy that guides a research project, from its conception to the final analysis of data.
• Research designs for quantitative studies include descriptive , correlational , experimental and quasi-experimenta l designs.
• Research designs for qualitative studies include phenomenological , grounded theory , ethnographic and case study designs.
• When choosing a research design, you need to consider a variety of factors, including the type of data you’ll be working with, your research aims and questions, your time and the resources available to you.

If you need a helping hand with your research design (or any other aspect of your research), check out our private coaching services .

Psst... there’s more!

This post was based on one of our popular Research Bootcamps . If you're working on a research project, you'll definitely want to check this out ...

You Might Also Like:

Is there any blog article explaining more on Case study research design? Is there a Case study write-up template? Thank you.

Thanks this was quite valuable to clarify such an important concept.

Thanks for this simplified explanations. it is quite very helpful.

This was really helpful. thanks

Thank you for your explanation. I think case study research design and the use of secondary data in researches needs to be talked about more in your videos and articles because there a lot of case studies research design tailored projects out there.

Please is there any template for a case study research design whose data type is a secondary data on your repository?

This post is very clear, comprehensive and has been very helpful to me. It has cleared the confusion I had in regard to research design and methodology.

This post is helpful, easy to understand, and deconstructs what a research design is. Thanks

how to cite this page

Thank you very much for the post. It is wonderful and has cleared many worries in my mind regarding research designs. I really appreciate .

Submit a Comment Cancel reply

Your email address will not be published. Required fields are marked *

Save my name, email, and website in this browser for the next time I comment.

• Print Friendly

Want to create or adapt books like this? Learn more about how Pressbooks supports open publishing practices.

2 Types of Quantitative Research Designs

There are three main groups of Research Designs that will be explored in this chapter.

• Experimental
• Quasi-experimental
• Non-experimental

When reviewing each design, the purpose and key features of the design, advantages and disadvantages, and the most commonly used designs within the category will be reviewed.

1. Experimental Design 

Purpose:  Evaluate outcomes in terms of efficacy and/or cost effectiveness

Experimental design features include: 

• Randomization of subjects to groups
• Manipulation of independent variable (e.g., an intervention or treatment)
• ​​Control – the use of a control group and control measures (for controlling extraneous variables )​

Advantages:   

• Most appropriate for testing cause-and-effect relationships (e.g., generalizability is most likely)
• Provides the highest level of evidence (e.g., level II) for single studies

Disadvantages: 

• Attrition especially control group participants or with ‘before-after’ experimental designs
• Feasibility and logistics may be an issue is certain settings (e.g., long-term care homes)

Caution: Not all research questions are amenable to experimental manipulation or randomization

Most Commonly Used Experimental Designs

• True experimental (pre- post-test ) design (also referred to as Randomized Control Trials or RCTs ):

Figure 3. True experimental design (pre-post-test).

• After-only (post-test only) design :

Figure 4. After-only (post-test only) design.

• Solomon four-group design

This design is similar to the true experimental design but has an additional two groups, for a total of four groups. Two groups are experimental, while two groups are control. These “extra” groups do not receive the pre-test, allowing the researchers to evaluate the effect of the pretest on the post-test in the first two groups.

2. Quasi-Experimental Design

Purpose: Similar to experimental design, but used when not all the features of an experimental design can be met:

• Manipulation of the independent variable (e.g., an intervention or treatment)
• Experimental and control groups may not be randomly assigned (no randomization)
• There may or may not be a control group

Advantages: 

• Feasibility and logistics are enhanced, particularly in clinical settings
• Offers some degree of generalizability (e.g., applicable to population of interest)
• May be more adaptable in real-world practice environments

Disadvantages:   

• Generally weaker than experimental designs because groups may not be equal with respect to extraneous variable due to the lack of randomization
• As a result, cause-and-effect relationships are difficult to claim

Options for Quasi-experimental Designs include :

• Non-equivalent control group design 

Figure 5. Classical Quasi-Experimental Design. Adapted from Knowledge for Health

• After-only control group design

Figure 6. Post-Test Only Quasi-Experimental Design. Adapted from Knowledge for Health.

• Time-series design Important note: The time series design is considered quasi-experimental because subjects serve as their ‘own controls’ (same group of people, compared before and after the intervention for changes over time). 

Figure 7. Time-series design. Adapted from Knowledge for Health

• One group pre-test-post-design design In this design there is no control group. The one group, considered the experimental group, is tested pre and post the intervention. The design is still considered quasi-experimental as there is manipulation of the intervention.

3. Non-experimental

Purpose: When the problem to be solved or examined is not amenable to experimentation; used when the researcher wants to:

• Study a phenomenon at one point in time or over a period of time
• Study (and measure) variables as they naturally occur
• Test relationships and differences among variables
• Used when the knowledge base on a phenomenon of interest is limited or when the research question is broad or exploratory in nature
• Appropriate for forecasting or making predictions
• Useful when the features of an experiment (e.g., randomization, control, and manipulation) are not appropriate or possible (e.g., ethical issues)
• Inability to claim cause-and-effect relationships

Options for Non-experimental Designs include:

• Survey studies: descriptive, exploratory, comparative
• Relationship or difference studies: Correlational, developmental
• Cross-sectional studies
• Longitudinal or Prospective studies

Figure 8. Longitudinal or Prospective studies. Adapted from University of Minnesota, Driven for Discover Libraries .

• Retrospective ( Ex Post Facto ) studies

Additional terms to consider when reading research

Learners may find it difficult when reading research to identify the Research Design used. Please consult the table below for more information on terms frequently used in research.

This refers to how the sample is selected. When randomization is used each participant from the desired population has an equal chance of being assigned to the experimental or control group.

These are variable that may interfere with the independent and dependent variables. Also called mediating variables.

The loss of participants from the study.

An Introduction to Quantitative Research Design for Students in Health Sciences Copyright © 2024 by Amy Hallaran and Julie Gaudet is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License , except where otherwise noted.

Share This Book

Types Of Quantitative Research Designs And Methods

Quantitative research design uses a variety of empirical methods to assess a phenomenon. The most common method is the experiment,…

Quantitative research design uses a variety of empirical methods to assess a phenomenon. The most common method is the experiment, but there are other types of quantitative research as well, such as correlation studies and case studies.

In contrast with qualitative research, which relies on subjective interpretations and extensive explorations, the various types of quantitative methods use objective analysis to reveal patterns and relations among data points that often have a numerical value. Quantitative research provides a mathematical summary of the results.

Let’s look at quantitative research design, the types of quantitative research methods and their respective strengths and weaknesses.

Types Of Quantitative Research

Components of quantitative research design.

If a researcher is studying a single variable, time, space, or another construct, they’re engaged in qualitative research. However, if that variable is a collection of quantitative data points—such as the number of employees that use a workplace break room compared to the number of employees who use other break rooms—the researcher is engaged in quantitative research.

Here are some methods commonly used in quantitative research design:

1. Experiment

The experiment is perhaps the most common way for quantitative researchers to gather data. In this method, researchers manipulate one variable at a time, while they hold all other variables constant. If a researcher wishes to determine which type of computer mouse is easier for employees to use, they must ensure the employees are experienced with computers, comfortable with their chairs or desks and have no issues with their eyesight. Common methods for this type of research include randomized experiments, non-randomized experiments, clinical trials and field studies.

2. Correlation

Correlation studies come in many forms, from simple correlation diagrams to the analysis of multiple variables. For instance, a researcher examining rates of depression among veterinarians could look at associations between self-perceived social status, salary and depression.

3. Cohort Studies

Cohort studies provide a way to measure the extent of change over a period of time. This type of research can lead to results that are both objective and subjective, depending on the type of study employed. For instance, a cohort study examining police officer salaries could determine what salary a police officer should make in an area. However, this same study could also delve into the subjective question of whether police officers are fairly paid compared to other professions.

Research design is a critical factor in the success of a study.

While there are many types of quantitative research methods that can be employed, the basic parts of all research designs are the same. Here are the principal components:

At the heart of every research project is a well-framed and considered question. Having a clear objective is the most important part of quantitative research design. Some examples of research questions could be:

• Which type of coffee brewing method extracts the most flavor?
• Which books are contributing most to a publisher’s profit?
• Which newspaper is the most widely read in a city?

In quantitative research design, researchers may explore the relationship between variables in a correlation study, or it could mean determining what variables are best in an experiment.

Once the aim is in place, the actual data collection method must be chosen. This will depend on the data needed to answer the research question. Some options are:

• Participant observations
• Experimental data

As long as the data is expressed numerically, it is quantitative data.

The selection process used to choose participants is a critical component of all types of quantitative research designs. Researchers need a well-defined population. This group can be as small as two people, but it could also be thousands of people as well.

Data Analysis

Once the data is collated, a researcher must decide how to analyze it. Some options at their disposal include:

• Descriptive analysis
• Content analysis
• Statistical tests

Once again, it depends on the research question and the goals of the study.

Presentation

This is sometimes referred to as dissemination. How will the research findings be shared with the world? Common choices are:

• Presentations
• Website articles and blogs

A quantitative researcher’s greatest contribution is that their work can be replicated. Because quantitative research relies on numbers, the results of the study can be exactly duplicated by other researchers.

With Harappa’s Thinking Critically course, professionals at all levels of their careers will learn how to organize their thoughts with the most impact. Assessing available information is an important part of this. Making gut decisions isn’t the mark of a mature manager—when decisions need to be made, all data must be considered dispassionately. These insights then need to be shared with team members and bosses. Give your teams the best chance of success with this course that delivers transformative skills.

Explore Harappa Diaries to learn more about topics such as What is Qualitative Research , Types Of Qualitative Research Methods , Quantitative Vs Qualitative Research and How To Apply Starbursting Technique to upgrade your knowledge and skills.

Quantitative and Qualitative Research

• I NEED TO . . .

What is Quantitative Research?

• What is Qualitative Research?
• Quantitative vs Qualitative
• Step 1: Accessing CINAHL
• Step 2: Create a Keyword Search
• Step 3: Create a Subject Heading Search
• Step 4: Repeat Steps 1-3 for Second Concept
• Step 5: Repeat Steps 1-3 for Quantitative Terms
• Step 6: Combining All Searches
• Step 7: Adding Limiters
• Step 8: Save Your Search!
• What Kind of Article is This?
• More Research Help This link opens in a new window

Quantitative methodology is the dominant research framework in the social sciences. It refers to a set of strategies, techniques and assumptions used to study psychological, social and economic processes through the exploration of numeric patterns . Quantitative research gathers a range of numeric data. Some of the numeric data is intrinsically quantitative (e.g. personal income), while in other cases the numeric structure is  imposed (e.g. ‘On a scale from 1 to 10, how depressed did you feel last week?’). The collection of quantitative information allows researchers to conduct simple to extremely sophisticated statistical analyses that aggregate the data (e.g. averages, percentages), show relationships among the data (e.g. ‘Students with lower grade point averages tend to score lower on a depression scale’) or compare across aggregated data (e.g. the USA has a higher gross domestic product than Spain). Quantitative research includes methodologies such as questionnaires, structured observations or experiments and stands in contrast to qualitative research. Qualitative research involves the collection and analysis of narratives and/or open-ended observations through methodologies such as interviews, focus groups or ethnographies.

Coghlan, D., Brydon-Miller, M. (2014).  The SAGE encyclopedia of action research  (Vols. 1-2). London, : SAGE Publications Ltd doi: 10.4135/9781446294406

What is the purpose of quantitative research?

The purpose of quantitative research is to generate knowledge and create understanding about the social world. Quantitative research is used by social scientists, including communication researchers, to observe phenomena or occurrences affecting individuals. Social scientists are concerned with the study of people. Quantitative research is a way to learn about a particular group of people, known as a sample population. Using scientific inquiry, quantitative research relies on data that are observed or measured to examine questions about the sample population.

Allen, M. (2017).  The SAGE encyclopedia of communication research methods  (Vols. 1-4). Thousand Oaks, CA: SAGE Publications, Inc doi: 10.4135/9781483381411

How do I know if the study is a quantitative design?  What type of quantitative study is it?

Quantitative Research Designs: Descriptive non-experimental, Quasi-experimental or Experimental?

Studies do not always explicitly state what kind of research design is being used.  You will need to know how to decipher which design type is used.  The following video will help you determine the quantitative design type.

• << Previous: I NEED TO . . .
• Next: What is Qualitative Research? >>
• Last Updated: Dec 8, 2023 10:05 PM
• URL: https://libguides.uta.edu/quantitative_and_qualitative_research

University of Texas Arlington Libraries 702 Planetarium Place · Arlington, TX 76019 · 817-272-3000

• Internet Privacy
• Accessibility
• Problems with a guide? Contact Us.

An official website of the United States government

The .gov means it's official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

• Publications
• Account settings
• Browse Titles

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-.

StatPearls [Internet].

Human subjects research design.

Marlon L. Bayot ; Grace D. Brannan ; Janelle M. Brannan ; Steven Tenny .

Affiliations

Last Update: August 14, 2023 .

• Definition/Introduction

Human subjects research is a heavily regulated type of research, hence this paper will start with two critical definitions. The US Department of Health and Human Services (HHS) Code of Federal Regulations, 45 CFR 46, provides the following definitions: [1]  “A living individual about whom an investigator (whether professional or student) conducting research:

• Obtains information or biospecimens through intervention or interaction with the individual, and uses, studies, or analyzes the information or biospecimens; or
• Obtains, uses, studies, analyzes, or generates identifiable private information or identifiable biospecimens."

Research means “a systematic investigation, including research development, testing and evaluation, designed to develop or contribute to generalizable knowledge.” Human subjects research is at the intersection of these two federal definitions and must obtain Institutional Review Board approval before starting, regardless of the type of design involved. The topic of a human research study varies and can include building a theory or hypothesis, determining patient satisfaction, or testing a medication, tool, device, process, or health intervention, to name a few. 

Research studies are classified into a qualitative study, a quantitative study, or a combination of both, called a mixed-methods study. [2] [3]  Qualitative studies gather non-numerical data, whereas quantitative research involves collecting numerical data. Other classifications of research studies exist depending on the purpose and utility of the study, [4]  examples include health systems research and operational research. [5] This review will be limited to the most common quantitative and qualitative research designs.

Quantitative Research

A research study can be done to describe variables and/or to determine the association of test and outcome variables regarding the research topic. [1] Quantitative research studies also subdivide into either interventional studies or non-interventional (observational) studies.  For interventional research studies, the researcher performs some intervention or manipulation of one or more groups in the research study and compares the outcomes to the other groups to help analyze the variables of interest. It may or may not be randomized, although a randomized controlled trial is considered a gold standard, as randomization of patients into the treatment groups reduce bias. Interventional studies apply to medical drugs, biologics, and devices.

For observational or non-interventional research studies, the investigator gathers data for identified variables of interest without any intervention or outside influence by the investigator on the groups under study. Cohort, cross-sectional, and case-control are the common types. [2]

A cohort study involves longitudinally following a group or groups of population with certain known exposures to determine who develops certain diseases or illnesses. This type of study could establish causal relationships between exposure and outcomes such as illness. [2] A cross-sectional study deals with a population at a given point in time as opposed to longitudinally and could provide information such as prevalence. Case-control studies compare populations with and without the exposure to determine if an illness will develop and at what rate in either group. A classic example is comparing smokers and non-smokers to determine which group develops lung cancer.

Qualitative Research

Qualitative research aims to answer the more open-ended questions that arise during the research process. Rather than trying to answer quantitative ‘how much’ or ‘how many’-type questions, qualitative research seeks to answer ‘how’ and ‘why’ questions. [3] Qualitative research often aims to understand and explain why or how a phenomenon is the way it is in order to provide insights and explanations of real-life problems and experiences. [4] Qualitative research can be used alone, in conjunction with quantitative research in mixed methods research, or as a way to explain the findings of a quantitative study because a quantitative study might show that there is a correlation between two things, but a qualitative study could then tell why that correlation exists, and not just that it does indeed exist.

There are many approaches used for qualitative research. Some of the most common are ethnography, grounded theory, phenomenology, and narrative research. [3] Ethnography is an approach that involves the researcher to be immersed in their participant’s environment, and through this immersion, collect insight into the actions, behaviors, and events that could aid them in their research. [4]  Grounded theory is an approach where the researcher observes the population of interest in order to develop a theory that explains the topic of interest. [3] Phenomenology as an approach emphasizes the importance of the ‘lived experience’ for explaining phenomena. [4] Grounded theory and phenomenology are similar, but grounded theory focuses on observation as a whole to create a theory, whereas phenomenology focuses on the perspective of participants themselves to explain why or how something happens. Lastly, narrative research showcases one of qualitative research’s strengths, the ability to tell a story. When research includes the perspective of the individuals involved, it can create robust theory-building because it takes into account the real-life implications and impacts of phenomena in a way that quantitative research often lacks. Data for qualitative research is collected in many ways, including interviews, focus groups, case studies, and medical record reviews.

Mixed Methods Research

In some cases, a combination of both qualitative and quantitative methods, or what is called a mixed-methods research is performed. Mixed methods approaches that combine qualitative and quantitative research can allow for hypothesis generation and hypothesis testing to help try to answer questions in a more well-rounded way. This is usually done to get the benefits of both numerical and non-numerical information to answer the research questions on hand. For example, a cross-sectional study found that young teens are vaping at a high rate. For further elucidation of the reasons why these teens vape, a subsequent focus group could be performed. 

• Issues of Concern

One of the primary concerns in doing research is the identification and formulation of the research problem (i.e., research question). [5]  The research problem should be ethical, researchable, significant, and feasible. In medicine, the goal of the research is not only to add relevant findings to the scientific body of knowledge but also to provide a beneficial, useful contribution to stakeholders, particularly the patients.

The second area of concern for research studies is selecting the correct research study to perform.  Many times descriptive and qualitative research must first take place to produce a robust, significant, and feasible research hypothesis for later quantitative research methods. [6]   Additionally, different research study types have different levels of strength and risk of bias as delineated in the hierarchy of research study designs. [7]  

• Clinical Significance

The significance of research studies and its findings collectively support both clinical and public health needs. The discovery of new medicines and new treatment modalities for specific diseases is possible using randomized clinical (control) trials, more commonly termed as RCTs. [8] Public health, both as medical and social science, can choose from a wide range of qualitative studies, descriptive, analytic, community-based trials [9] , and operations researches, among others, to explore and describe the characteristics of certain groups of populations and its associations to the disease process or a particular health intervention, yielding findings that will inform policymakers and stakeholders.

In clinical settings, case studies and case series can be used by clinicians, surgeons, and other clinical specialists to scientifically document and describe the occurrence of rare diseases. [10]  Researchers can perform studies to determine the association of exposure variables or risk factors in rare diseases or cohort studies to investigate rare exposure variables present in the study population. Meanwhile, studies such as meta-analysis and systematic review are good choices for researchers who want to summarize the results of previous research findings, in quantitative and qualitative means, respectively. [11] [12] Mixed methods are employed to combine and exhaust the utility of the research type or study design combinations (e.g., quantitative and qualitative studies). [13]

Research studies can be both simple and complex; thus, they can be performed in several ways, which must be consistently systematic and scientific. The acquisition of new research findings will eventually find utility in the application of evidence-based medicine (EBM). [14] Research studies must be carried out within the walls of medical ethics, free of bias, and primarily geared towards the welfare of our patients rather than just merely the expedition of science. [15]

• Review Questions
• Access free multiple choice questions on this topic.
• Comment on this article.

Disclosure: Marlon Bayot declares no relevant financial relationships with ineligible companies.

Disclosure: Grace Brannan declares no relevant financial relationships with ineligible companies.

Disclosure: Janelle Brannan declares no relevant financial relationships with ineligible companies.

Disclosure: Steven Tenny declares no relevant financial relationships with ineligible companies.

This book is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits others to distribute the work, provided that the article is not altered or used commercially. You are not required to obtain permission to distribute this article, provided that you credit the author and journal.

• Cite this Page Bayot ML, Brannan GD, Brannan JM, et al. Human Subjects Research Design. [Updated 2023 Aug 14]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-.

In this Page

Bulk download.

• Bulk download StatPearls data from FTP

Related information

• PMC PubMed Central citations
• PubMed Links to PubMed

Similar articles in PubMed

• Recognizing Alcohol and Drug Impairment in the Workplace in Florida. [StatPearls. 2024] Recognizing Alcohol and Drug Impairment in the Workplace in Florida. Toney-Butler TJ, Siela D. StatPearls. 2024 Jan
• Pilot Medical Certification. [StatPearls. 2024] Pilot Medical Certification. Matthews MJ, Stretanski MF. StatPearls. 2024 Jan
• Currently effective Indian Health Service eligibility regulations. Indian Health Service, HHS. Republication of currently effective Indian Health Service eligibility regulations. [Fed Regist. 1999] Currently effective Indian Health Service eligibility regulations. Indian Health Service, HHS. Republication of currently effective Indian Health Service eligibility regulations. . Fed Regist. 1999 Oct 28; 64(208):58318-22.
• Review How to Determine if a Project Is Human Subjects Research, a Quality Improvement Project, or Both. [Ochsner J. 2020] Review How to Determine if a Project Is Human Subjects Research, a Quality Improvement Project, or Both. Bass PF 3rd, Maloy JW. Ochsner J. 2020 Spring; 20(1):56-61.
• Review Understanding Food and Drug Administration regulatory requirements for an investigational device exemption for sponsor-investigators. [J Investig Med. 2012] Review Understanding Food and Drug Administration regulatory requirements for an investigational device exemption for sponsor-investigators. Holbein ME, Berglund JP. J Investig Med. 2012 Oct; 60(7):987-94.

Recent Activity

• Human Subjects Research Design - StatPearls Human Subjects Research Design - StatPearls

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

Connect with NLM

National Library of Medicine 8600 Rockville Pike Bethesda, MD 20894

Web Policies FOIA HHS Vulnerability Disclosure

Help Accessibility Careers

• Privacy Policy

Buy Me a Coffee

Home » Research Design – Types, Methods and Examples

Research Design – Types, Methods and Examples

Table of Contents

Research Design

Definition:

Research design refers to the overall strategy or plan for conducting a research study. It outlines the methods and procedures that will be used to collect and analyze data, as well as the goals and objectives of the study. Research design is important because it guides the entire research process and ensures that the study is conducted in a systematic and rigorous manner.

Types of Research Design

Types of Research Design are as follows:

Descriptive Research Design

This type of research design is used to describe a phenomenon or situation. It involves collecting data through surveys, questionnaires, interviews, and observations. The aim of descriptive research is to provide an accurate and detailed portrayal of a particular group, event, or situation. It can be useful in identifying patterns, trends, and relationships in the data.

Correlational Research Design

Correlational research design is used to determine if there is a relationship between two or more variables. This type of research design involves collecting data from participants and analyzing the relationship between the variables using statistical methods. The aim of correlational research is to identify the strength and direction of the relationship between the variables.

Experimental Research Design

Experimental research design is used to investigate cause-and-effect relationships between variables. This type of research design involves manipulating one variable and measuring the effect on another variable. It usually involves randomly assigning participants to groups and manipulating an independent variable to determine its effect on a dependent variable. The aim of experimental research is to establish causality.

Quasi-experimental Research Design

Quasi-experimental research design is similar to experimental research design, but it lacks one or more of the features of a true experiment. For example, there may not be random assignment to groups or a control group. This type of research design is used when it is not feasible or ethical to conduct a true experiment.

Case Study Research Design

Case study research design is used to investigate a single case or a small number of cases in depth. It involves collecting data through various methods, such as interviews, observations, and document analysis. The aim of case study research is to provide an in-depth understanding of a particular case or situation.

Longitudinal Research Design

Longitudinal research design is used to study changes in a particular phenomenon over time. It involves collecting data at multiple time points and analyzing the changes that occur. The aim of longitudinal research is to provide insights into the development, growth, or decline of a particular phenomenon over time.

Structure of Research Design

The format of a research design typically includes the following sections:

• Introduction : This section provides an overview of the research problem, the research questions, and the importance of the study. It also includes a brief literature review that summarizes previous research on the topic and identifies gaps in the existing knowledge.
• Research Questions or Hypotheses: This section identifies the specific research questions or hypotheses that the study will address. These questions should be clear, specific, and testable.
• Research Methods : This section describes the methods that will be used to collect and analyze data. It includes details about the study design, the sampling strategy, the data collection instruments, and the data analysis techniques.
• Data Collection: This section describes how the data will be collected, including the sample size, data collection procedures, and any ethical considerations.
• Data Analysis: This section describes how the data will be analyzed, including the statistical techniques that will be used to test the research questions or hypotheses.
• Results : This section presents the findings of the study, including descriptive statistics and statistical tests.
• Discussion and Conclusion : This section summarizes the key findings of the study, interprets the results, and discusses the implications of the findings. It also includes recommendations for future research.
• References : This section lists the sources cited in the research design.

Example of Research Design

An Example of Research Design could be:

Research question: Does the use of social media affect the academic performance of high school students?

Research design:

• Research approach : The research approach will be quantitative as it involves collecting numerical data to test the hypothesis.
• Research design : The research design will be a quasi-experimental design, with a pretest-posttest control group design.
• Sample : The sample will be 200 high school students from two schools, with 100 students in the experimental group and 100 students in the control group.
• Data collection : The data will be collected through surveys administered to the students at the beginning and end of the academic year. The surveys will include questions about their social media usage and academic performance.
• Data analysis : The data collected will be analyzed using statistical software. The mean scores of the experimental and control groups will be compared to determine whether there is a significant difference in academic performance between the two groups.
• Limitations : The limitations of the study will be acknowledged, including the fact that social media usage can vary greatly among individuals, and the study only focuses on two schools, which may not be representative of the entire population.
• Ethical considerations: Ethical considerations will be taken into account, such as obtaining informed consent from the participants and ensuring their anonymity and confidentiality.

How to Write Research Design

Writing a research design involves planning and outlining the methodology and approach that will be used to answer a research question or hypothesis. Here are some steps to help you write a research design:

• Define the research question or hypothesis : Before beginning your research design, you should clearly define your research question or hypothesis. This will guide your research design and help you select appropriate methods.
• Select a research design: There are many different research designs to choose from, including experimental, survey, case study, and qualitative designs. Choose a design that best fits your research question and objectives.
• Develop a sampling plan : If your research involves collecting data from a sample, you will need to develop a sampling plan. This should outline how you will select participants and how many participants you will include.
• Define variables: Clearly define the variables you will be measuring or manipulating in your study. This will help ensure that your results are meaningful and relevant to your research question.
• Choose data collection methods : Decide on the data collection methods you will use to gather information. This may include surveys, interviews, observations, experiments, or secondary data sources.
• Create a data analysis plan: Develop a plan for analyzing your data, including the statistical or qualitative techniques you will use.
• Consider ethical concerns : Finally, be sure to consider any ethical concerns related to your research, such as participant confidentiality or potential harm.

When to Write Research Design

Research design should be written before conducting any research study. It is an important planning phase that outlines the research methodology, data collection methods, and data analysis techniques that will be used to investigate a research question or problem. The research design helps to ensure that the research is conducted in a systematic and logical manner, and that the data collected is relevant and reliable.

Ideally, the research design should be developed as early as possible in the research process, before any data is collected. This allows the researcher to carefully consider the research question, identify the most appropriate research methodology, and plan the data collection and analysis procedures in advance. By doing so, the research can be conducted in a more efficient and effective manner, and the results are more likely to be valid and reliable.

Purpose of Research Design

The purpose of research design is to plan and structure a research study in a way that enables the researcher to achieve the desired research goals with accuracy, validity, and reliability. Research design is the blueprint or the framework for conducting a study that outlines the methods, procedures, techniques, and tools for data collection and analysis.

Some of the key purposes of research design include:

• Providing a clear and concise plan of action for the research study.
• Ensuring that the research is conducted ethically and with rigor.
• Maximizing the accuracy and reliability of the research findings.
• Minimizing the possibility of errors, biases, or confounding variables.
• Ensuring that the research is feasible, practical, and cost-effective.
• Determining the appropriate research methodology to answer the research question(s).
• Identifying the sample size, sampling method, and data collection techniques.
• Determining the data analysis method and statistical tests to be used.
• Facilitating the replication of the study by other researchers.
• Enhancing the validity and generalizability of the research findings.

Applications of Research Design

There are numerous applications of research design in various fields, some of which are:

• Social sciences: In fields such as psychology, sociology, and anthropology, research design is used to investigate human behavior and social phenomena. Researchers use various research designs, such as experimental, quasi-experimental, and correlational designs, to study different aspects of social behavior.
• Education : Research design is essential in the field of education to investigate the effectiveness of different teaching methods and learning strategies. Researchers use various designs such as experimental, quasi-experimental, and case study designs to understand how students learn and how to improve teaching practices.
• Health sciences : In the health sciences, research design is used to investigate the causes, prevention, and treatment of diseases. Researchers use various designs, such as randomized controlled trials, cohort studies, and case-control studies, to study different aspects of health and healthcare.
• Business : Research design is used in the field of business to investigate consumer behavior, marketing strategies, and the impact of different business practices. Researchers use various designs, such as survey research, experimental research, and case studies, to study different aspects of the business world.
• Engineering : In the field of engineering, research design is used to investigate the development and implementation of new technologies. Researchers use various designs, such as experimental research and case studies, to study the effectiveness of new technologies and to identify areas for improvement.

Advantages of Research Design

Here are some advantages of research design:

• Systematic and organized approach : A well-designed research plan ensures that the research is conducted in a systematic and organized manner, which makes it easier to manage and analyze the data.
• Clear objectives: The research design helps to clarify the objectives of the study, which makes it easier to identify the variables that need to be measured, and the methods that need to be used to collect and analyze data.
• Minimizes bias: A well-designed research plan minimizes the chances of bias, by ensuring that the data is collected and analyzed objectively, and that the results are not influenced by the researcher’s personal biases or preferences.
• Efficient use of resources: A well-designed research plan helps to ensure that the resources (time, money, and personnel) are used efficiently and effectively, by focusing on the most important variables and methods.
• Replicability: A well-designed research plan makes it easier for other researchers to replicate the study, which enhances the credibility and reliability of the findings.
• Validity: A well-designed research plan helps to ensure that the findings are valid, by ensuring that the methods used to collect and analyze data are appropriate for the research question.
• Generalizability : A well-designed research plan helps to ensure that the findings can be generalized to other populations, settings, or situations, which increases the external validity of the study.

Research Design Vs Research Methodology

About the author.

Muhammad Hassan

Researcher, Academic Writer, Web developer

You may also like

How to Cite Research Paper – All Formats and...

Data Collection – Methods Types and Examples

Delimitations in Research – Types, Examples and...

Research Paper Format – Types, Examples and...

Research Process – Steps, Examples and Tips

Institutional Review Board – Application Sample...

Leave a comment x.

Save my name, email, and website in this browser for the next time I comment.

• Survey Software The world’s leading omnichannel survey software
• Online Survey Tools Create sophisticated surveys with ease.
• Mobile Offline Conduct efficient field surveys.
• Text Analysis
• Close The Loop
• Automated Translations
• NPS Dashboard
• CATI Manage high volume phone surveys efficiently
• Cloud/On-premise Dialer TCPA compliant Cloud on-premise dialer
• IVR Survey Software Boost productivity with automated call workflows.
• Analytics Analyze survey data with visual dashboards
• Panel Manager Nurture a loyal community of respondents.
• Survey Portal Best-in-class user friendly survey portal.
• Voxco Audience Conduct targeted sample research in hours.
• Predictive Analytics
• Customer 360
• Customer Loyalty
• Fraud & Risk Management
• AI/ML Enablement Services
• Credit Underwriting

Find the best survey software for you! (Along with a checklist to compare platforms)

Get Buyer’s Guide

• 100+ question types
• Drag-and-drop interface
• Skip logic and branching
• Multi-lingual survey
• Text piping
• Question library
• CSS customization
• White-label surveys
• Customizable ‘Thank You’ page
• Customizable survey theme
• Reminder send-outs
• Survey rewards
• Social media
• SMS surveys
• Website surveys
• Correlation analysis
• Cross-tabulation analysis
• Trend analysis
• Real-time dashboard
• Customizable report
• Email address validation
• Recaptcha validation
• SSL security

Take a peek at our powerful survey features to design surveys that scale discoveries.

Download feature sheet.

• Hospitality
• Financial Services
• Academic Research
• Customer Experience
• Employee Experience
• Product Experience
• Market Research
• Social Research
• Data Analysis
• Banking & Financial Services
• Retail Solution
• Risk Management
• Customer Lifecycle Solutions
• Net Promoter Score
• Customer Behaviour Analytics
• Customer Segmentation
• Data Unification

Explore Voxco 

Need to map Voxco’s features & offerings? We can help!

Watch a Demo 

Download Brochures 

Get a Quote

• NPS Calculator
• CES Calculator
• A/B Testing Calculator
• Margin of Error Calculator
• Sample Size Calculator
• CX Strategy & Management Hub
• Market Research Hub
• Patient Experience Hub
• Employee Experience Hub
• Market Research Guide
• Customer Experience Guide
• The Voxco Guide to Customer Experience
• NPS Knowledge Hub
• Survey Research Guides
• Survey Template Library
• Webinars and Events
• Feature Sheets
• Try a sample survey
• Professional services
• Blogs & White papers
• Case Studies

Find the best customer experience platform

Uncover customer pain points, analyze feedback and run successful CX programs with the best CX platform for your team.

Get the Guide Now

We’ve been avid users of the Voxco platform now for over 20 years. It gives us the flexibility to routinely enhance our survey toolkit and provides our clients with a more robust dataset and story to tell their clients.

VP Innovation & Strategic Partnerships, The Logit Group

• Client Stories
• Voxco Reviews
• Why Voxco Research?
• Why Voxco Intelligence?
• Careers at Voxco
• Vulnerabilities and Ethical Hacking

Explore Regional Offices

• Cloud/On-premise Dialer TCPA compliant Cloud & on-premise dialer
• Fraud & Risk Management

Get Buyer’s Guide

• Banking & Financial Services

Explore Voxco 

Watch a Demo 

Download Brochures 

• CX Strategy & Management Hub
• Blogs & White papers

VP Innovation & Strategic Partnerships, The Logit Group

• Our clients
• Client stories
• Featuresheets

5 Types Of Quantitative Research

• July 15, 2021

SHARE THE ARTICLE ON

When you decide to gather numerical data from your target audience the research method you use is called quantitative research. In this research, you make use of closed-ended questions where the answer options are associated with a numerical value. Once you have collected the value you use analysis tools to turn them into insights. 

This sums up the process of conducting quantitative research. However, there are five types of quantitative research based on the approach you use to collect the data. And, the purpose of this blog is to explore the five kinds of quantitative research .

What is quantitative research?

The research design for quantitative data refers to the collection and evaluation of numerical data to test a hypothesis or to identify patterns and correlations within the numbers. Quantitative research is different from qualitative research, which involves the collection and evaluation of non-numerical data. 

Quantitative research is concerned with identifying the facts about different social phenomena.  In the research design for the quantitative approach, the aim is to quantify variables and measure their effects. 

The research involves gathering numerical data through surveys or experiments and then analyzing the data by administering statistical data analysis techniques to identify patterns, trends, and relationships. This systematic approach of collecting, analyzing, and interpreting quantitative data helps you draw objective and reliable conclusions.

Read how Voxco helped Walmart improve their Grocery PickUp service and increase product variety from 3k to 7k.

What are the types of quantitative research?

The quantitative approach to research ensures that the data you gather is accurate and reliable because it is in numerical form. This characteristic also provides a wider scope to analyze the data. In this section, we will discuss the five quantitative research design types and look into their advantages and real-world examples. 

There are five types of quantitative research designs , and they are:

• Descriptive Research 
• Survey Research
• Correlational Research 
• Quasi-experimental Research Design
• Experimental Research  

These five types of research explain five different ways you can gather quantitative data. These five methodologies also vary due to the different procedures each type undertakes. Each approach helps gather insightful data that can help you in making confident decisions. 

Let’s explore these five types of quantitative research in detail. 

1. Descriptive Research Design 

Descriptive research is used to understand a phenomenon, a situation, or a population. Unlike experimental research, descriptive research does not involve the manipulation of certain variables. Rather, it seeks only to observe and measure the variables in order to investigate them. 

Among the types of quantitative research, this design is used when trying to identify characteristics, categories, and trends. The most common methods of collecting descriptive research are case studies, observations, and surveys. 

Advantages of descriptive research design: 

• The descriptive research design for a quantitative approach allows you to gather a detailed and nuanced understanding of the research objective. 
• The research method is relatively easy to implement and involves surveys, observation, etc. 
• It enables you to gather representative data that you can use to generalize the findings to a large population. 

Example of descriptive research design:

Using this quantitative research type, you can gather customer satisfaction feedback on the company’s customer service. You can conduct online surveys to assess various aspects of customer service, such as the time it took to connect with an agent, the agent’s politeness, knowledge, the effectiveness of the resolution, etc. 

The data can help you identify overall satisfaction levels and the areas that require improvement. 

2. Survey Research

Surveys are the most popular and common method to gather data. You can ask multiple questions to a wide population. The data analysis is also simple since you can use an online survey software that automatically analyzes data for you. 

You can choose to conduct surveys in two ways – cross-sectional and longitudinal. 

• Cross-sectional surveys are used when you want to conduct research at a given point in time.
• Longitudinal surveys, on the other hand, are used when you want to run surveys at various durations. 

Advantages of survey research:

• A survey is the most popular kind of quantitative research that allows you to gather data from a wider audience across multiple sources. 
• It is versatile in nature, allowing you to evaluate and gather data for various objectives across multiple industries. 
• Surveys use structured questionnaires enabling you to gather standardized data. 
• This quantitative research design allows you to provide respondents with anonymity and confidentiality, encouraging honest responses.

Example of survey research: 

A cafe can use surveys to gather feedback from its customer regarding their experience. They can ask questions about the layout, customer service, food quality, cleanliness, and satisfaction. 

The survey result can help the cafe owner identify areas where the cafe excels and areas for improvement.

Design interactive surveys with Voxco’s drag-and-drop survey maker.

100+ question types, advanced logic, branching, CSS customization, white-label, multi-lingual surveys, and more.

3. Correlational Research Design

Correlational research is a non-experimental research method used to identify a relationship between two variables with no influence from any extraneous variable. 

Among the types of quantitative research, this design can help you recognize patterns and trends in the feedback you gather. For example, an ice cream brand can use this methodology to identify the relationship between weather (temperature) and ice cream sales. 

The correlation between the two variables will reflect the direction and/or strength of their relationship. 

• A positive correlation denotes that both variables change in the same direction.
• A negative correlation denotes that the variables change in opposite directions. 
• A zero correlation denotes that there is no relationship between the variables being studied. 

Advantages of correlational research design:

• This quantitative research design type helps you establish relationships within variables without manipulating them. 
• You can predict the outcome and identify patterns and trends based on the observed relationship. 
•  In cases when experimental manipulation may be unethical, correlational research offers an alternative and ethical approach. 
• The approach involves collecting data from existing sources, making it a cost-effective quantitative research design. 

Example of correlational research design:

You can evaluate the impact of advertising on consumers’ purchase decisions. In this research, you can gather data on the advertising expenditure of a product and its corresponding sales data. 

By analyzing the data using correlational analysis, you can determine if there is a relationship between advertising spending and sales performance. 

4. Quasi-Experimental Research Design

Similar to the experimental research design, quasi-experimental research also aims to identify a cause-and-effect relationship between two variables, i.e., an independent variable and a dependent variable. 

However, quasi-experiment involves subjects being assigned to groups based on non-random criteria. 

Among the types of quantitative research, this design is often employed when true experiments cannot be carried out due to practical or ethical reasons. A notable advantage of this design is that it has higher external validity than most true experiments, as it often involves real-world interventions as opposed to an artificial laboratory setting. 

Advantages of quasi-experimental design:

• It allows you to compare different groups/conditions and explore the cause-and-effect relationship. 
• This research design of a quantitative approach often occurs in real-world settings. This allows for a high ecological validity which means you can apply the findings and generalize it to real-life situations. 
• The quantitative research type is more practical and feasible. 

Example of quasi-experimental research design:

You can evaluate the impact of pricing promotion on the sales volume using this type of quantitative research. 

In this research, you can select two stores that sell your product. You can implement a promotion in one store while the other store maintains the regular price. By comparing the sales volume data from both stores during the promotion period, you can assess its impact.

One-stop-shop to gather, measure, uncover, and act on insightful data.

Curious About The Price? Click Below To Get A Personalized Quote.

5. Experimental Research Design

Experimental research, also known as true experimentation , aims to measure the effect of one or more IVs on one or more DVs with the use of the scientific method. This is done by manipulating the independent variable to study its effects on the dependent variable. 

The experimental research design involves conducting a set of procedures to test the hypothesis of the study. Subjects within experimental research are randomly assigned to groups rather than being assigned to groups using non-random criteria. 

Advantages of experimental research design:

• The researcher has control over the extraneous variable, which allows for a high degree of internal validity in this research design for quantitative research. 
• Experimental research enables replication and verification of research outcomes, leading to increased confidence in the conclusion drawn. 
• It allows the researcher to manipulate the independent variable to assess its impact on the dependent variable. 

Example of experimental research design:

A company can use this quantitative research design type to test the impact of its new product compared to its older variation in the market. 

The company can experiment by randomly assigning the older variation to a control group and the new product variation to the experimental group. Then they can use surveys to gather respondents’ feedback and assess the performance of both products and the audiences’ preferences.

Wrapping up;

In quantitative research, the data you gather is collected and presented in its numerical value. There are five types of quantitative research approaches you can use to gather the desired data. 

This concludes our article on introducing the five quantitative research designs. In research, the quantitative data needs to have statistical significance in order for it to be a proper representation of the target population. 

For this reason, researchers often use online survey software to conduct quantitative research. The tool can help you build a target panel of respondents and also distribute your surveys across various channels.

Explore Voxco Survey Software

+ Omnichannel Survey Software 

+ Online Survey Software 

+ CATI Survey Software 

+ IVR Survey Software 

+ Market Research Tool

+ Customer Experience Tool 

+ Product Experience Software 

+ Enterprise Survey Software 

Best Survey Questions

Best Survey Questions SHARE THE ARTICLE ON Share on facebook Share on twitter Share on linkedin Table of Contents A well-designed survey can produce incredible

Ways to measure brand equity

Ways to measure brand equity Improve Brand Experience With Voxco Use our in-depth online Brand Awareness guide to Improve Your Brand Awareness Download Now SHARE

How to make the most of your online surveys?

As channels for gathering feedback from customers and employees, online surveys play a vital role in the organization’s growth. By gaining insights into how people

Building a research panel

How to build a market research panel? Transform your insight generation process Use our in-depth online survey guide to create an actionable feedback collection survey

Demographic survey template

Demographic survey template SHARE THE ARTICLE ON Table of Contents Why do you need demographic surveys? As a business, it is important for you to

Women in Research Technology: Voxco Celebrates International Women’s Day

In honor of International Women’s Day this year, we wanted to highlight the talented and diverse team at Voxco Survey Software. We relish any opportunity

We use cookies in our website to give you the best browsing experience and to tailor advertising. By continuing to use our website, you give us consent to the use of cookies. Read More

Looking for the best research tools?

Voxco offers the best online & offline survey research tools!

Numbers, Facts and Trends Shaping Your World

Read our research on:

Full Topic List

Regions & Countries

• Publications
• Our Methods
• Short Reads
• Tools & Resources

Read Our Research On:

Writing Survey Questions

Perhaps the most important part of the survey process is the creation of questions that accurately measure the opinions, experiences and behaviors of the public. Accurate random sampling will be wasted if the information gathered is built on a shaky foundation of ambiguous or biased questions. Creating good measures involves both writing good questions and organizing them to form the questionnaire.

Questionnaire design is a multistage process that requires attention to many details at once. Designing the questionnaire is complicated because surveys can ask about topics in varying degrees of detail, questions can be asked in different ways, and questions asked earlier in a survey may influence how people respond to later questions. Researchers are also often interested in measuring change over time and therefore must be attentive to how opinions or behaviors have been measured in prior surveys.

Surveyors may conduct pilot tests or focus groups in the early stages of questionnaire development in order to better understand how people think about an issue or comprehend a question. Pretesting a survey is an essential step in the questionnaire design process to evaluate how people respond to the overall questionnaire and specific questions, especially when questions are being introduced for the first time.

For many years, surveyors approached questionnaire design as an art, but substantial research over the past forty years has demonstrated that there is a lot of science involved in crafting a good survey questionnaire. Here, we discuss the pitfalls and best practices of designing questionnaires.

Question development

There are several steps involved in developing a survey questionnaire. The first is identifying what topics will be covered in the survey. For Pew Research Center surveys, this involves thinking about what is happening in our nation and the world and what will be relevant to the public, policymakers and the media. We also track opinion on a variety of issues over time so we often ensure that we update these trends on a regular basis to better understand whether people’s opinions are changing.

At Pew Research Center, questionnaire development is a collaborative and iterative process where staff meet to discuss drafts of the questionnaire several times over the course of its development. We frequently test new survey questions ahead of time through qualitative research methods such as  focus groups , cognitive interviews, pretesting (often using an  online, opt-in sample ), or a combination of these approaches. Researchers use insights from this testing to refine questions before they are asked in a production survey, such as on the ATP.

Measuring change over time

Many surveyors want to track changes over time in people’s attitudes, opinions and behaviors. To measure change, questions are asked at two or more points in time. A cross-sectional design surveys different people in the same population at multiple points in time. A panel, such as the ATP, surveys the same people over time. However, it is common for the set of people in survey panels to change over time as new panelists are added and some prior panelists drop out. Many of the questions in Pew Research Center surveys have been asked in prior polls. Asking the same questions at different points in time allows us to report on changes in the overall views of the general public (or a subset of the public, such as registered voters, men or Black Americans), or what we call “trending the data”.

When measuring change over time, it is important to use the same question wording and to be sensitive to where the question is asked in the questionnaire to maintain a similar context as when the question was asked previously (see  question wording  and  question order  for further information). All of our survey reports include a topline questionnaire that provides the exact question wording and sequencing, along with results from the current survey and previous surveys in which we asked the question.

The Center’s transition from conducting U.S. surveys by live telephone interviewing to an online panel (around 2014 to 2020) complicated some opinion trends, but not others. Opinion trends that ask about sensitive topics (e.g., personal finances or attending religious services ) or that elicited volunteered answers (e.g., “neither” or “don’t know”) over the phone tended to show larger differences than other trends when shifting from phone polls to the online ATP. The Center adopted several strategies for coping with changes to data trends that may be related to this change in methodology. If there is evidence suggesting that a change in a trend stems from switching from phone to online measurement, Center reports flag that possibility for readers to try to head off confusion or erroneous conclusions.

Open- and closed-ended questions

One of the most significant decisions that can affect how people answer questions is whether the question is posed as an open-ended question, where respondents provide a response in their own words, or a closed-ended question, where they are asked to choose from a list of answer choices.

For example, in a poll conducted after the 2008 presidential election, people responded very differently to two versions of the question: “What one issue mattered most to you in deciding how you voted for president?” One was closed-ended and the other open-ended. In the closed-ended version, respondents were provided five options and could volunteer an option not on the list.

When explicitly offered the economy as a response, more than half of respondents (58%) chose this answer; only 35% of those who responded to the open-ended version volunteered the economy. Moreover, among those asked the closed-ended version, fewer than one-in-ten (8%) provided a response other than the five they were read. By contrast, fully 43% of those asked the open-ended version provided a response not listed in the closed-ended version of the question. All of the other issues were chosen at least slightly more often when explicitly offered in the closed-ended version than in the open-ended version. (Also see  “High Marks for the Campaign, a High Bar for Obama”  for more information.)

Researchers will sometimes conduct a pilot study using open-ended questions to discover which answers are most common. They will then develop closed-ended questions based off that pilot study that include the most common responses as answer choices. In this way, the questions may better reflect what the public is thinking, how they view a particular issue, or bring certain issues to light that the researchers may not have been aware of.

When asking closed-ended questions, the choice of options provided, how each option is described, the number of response options offered, and the order in which options are read can all influence how people respond. One example of the impact of how categories are defined can be found in a Pew Research Center poll conducted in January 2002. When half of the sample was asked whether it was “more important for President Bush to focus on domestic policy or foreign policy,” 52% chose domestic policy while only 34% said foreign policy. When the category “foreign policy” was narrowed to a specific aspect – “the war on terrorism” – far more people chose it; only 33% chose domestic policy while 52% chose the war on terrorism.

In most circumstances, the number of answer choices should be kept to a relatively small number – just four or perhaps five at most – especially in telephone surveys. Psychological research indicates that people have a hard time keeping more than this number of choices in mind at one time. When the question is asking about an objective fact and/or demographics, such as the religious affiliation of the respondent, more categories can be used. In fact, they are encouraged to ensure inclusivity. For example, Pew Research Center’s standard religion questions include more than 12 different categories, beginning with the most common affiliations (Protestant and Catholic). Most respondents have no trouble with this question because they can expect to see their religious group within that list in a self-administered survey.

In addition to the number and choice of response options offered, the order of answer categories can influence how people respond to closed-ended questions. Research suggests that in telephone surveys respondents more frequently choose items heard later in a list (a “recency effect”), and in self-administered surveys, they tend to choose items at the top of the list (a “primacy” effect).

Because of concerns about the effects of category order on responses to closed-ended questions, many sets of response options in Pew Research Center’s surveys are programmed to be randomized to ensure that the options are not asked in the same order for each respondent. Rotating or randomizing means that questions or items in a list are not asked in the same order to each respondent. Answers to questions are sometimes affected by questions that precede them. By presenting questions in a different order to each respondent, we ensure that each question gets asked in the same context as every other question the same number of times (e.g., first, last or any position in between). This does not eliminate the potential impact of previous questions on the current question, but it does ensure that this bias is spread randomly across all of the questions or items in the list. For instance, in the example discussed above about what issue mattered most in people’s vote, the order of the five issues in the closed-ended version of the question was randomized so that no one issue appeared early or late in the list for all respondents. Randomization of response items does not eliminate order effects, but it does ensure that this type of bias is spread randomly.

Questions with ordinal response categories – those with an underlying order (e.g., excellent, good, only fair, poor OR very favorable, mostly favorable, mostly unfavorable, very unfavorable) – are generally not randomized because the order of the categories conveys important information to help respondents answer the question. Generally, these types of scales should be presented in order so respondents can easily place their responses along the continuum, but the order can be reversed for some respondents. For example, in one of Pew Research Center’s questions about abortion, half of the sample is asked whether abortion should be “legal in all cases, legal in most cases, illegal in most cases, illegal in all cases,” while the other half of the sample is asked the same question with the response categories read in reverse order, starting with “illegal in all cases.” Again, reversing the order does not eliminate the recency effect but distributes it randomly across the population.

Question wording

The choice of words and phrases in a question is critical in expressing the meaning and intent of the question to the respondent and ensuring that all respondents interpret the question the same way. Even small wording differences can substantially affect the answers people provide.

[View more Methods 101 Videos ]

An example of a wording difference that had a significant impact on responses comes from a January 2003 Pew Research Center survey. When people were asked whether they would “favor or oppose taking military action in Iraq to end Saddam Hussein’s rule,” 68% said they favored military action while 25% said they opposed military action. However, when asked whether they would “favor or oppose taking military action in Iraq to end Saddam Hussein’s rule  even if it meant that U.S. forces might suffer thousands of casualties, ” responses were dramatically different; only 43% said they favored military action, while 48% said they opposed it. The introduction of U.S. casualties altered the context of the question and influenced whether people favored or opposed military action in Iraq.

There has been a substantial amount of research to gauge the impact of different ways of asking questions and how to minimize differences in the way respondents interpret what is being asked. The issues related to question wording are more numerous than can be treated adequately in this short space, but below are a few of the important things to consider:

First, it is important to ask questions that are clear and specific and that each respondent will be able to answer. If a question is open-ended, it should be evident to respondents that they can answer in their own words and what type of response they should provide (an issue or problem, a month, number of days, etc.). Closed-ended questions should include all reasonable responses (i.e., the list of options is exhaustive) and the response categories should not overlap (i.e., response options should be mutually exclusive). Further, it is important to discern when it is best to use forced-choice close-ended questions (often denoted with a radio button in online surveys) versus “select-all-that-apply” lists (or check-all boxes). A 2019 Center study found that forced-choice questions tend to yield more accurate responses, especially for sensitive questions.  Based on that research, the Center generally avoids using select-all-that-apply questions.

It is also important to ask only one question at a time. Questions that ask respondents to evaluate more than one concept (known as double-barreled questions) – such as “How much confidence do you have in President Obama to handle domestic and foreign policy?” – are difficult for respondents to answer and often lead to responses that are difficult to interpret. In this example, it would be more effective to ask two separate questions, one about domestic policy and another about foreign policy.

In general, questions that use simple and concrete language are more easily understood by respondents. It is especially important to consider the education level of the survey population when thinking about how easy it will be for respondents to interpret and answer a question. Double negatives (e.g., do you favor or oppose  not  allowing gays and lesbians to legally marry) or unfamiliar abbreviations or jargon (e.g., ANWR instead of Arctic National Wildlife Refuge) can result in respondent confusion and should be avoided.

Similarly, it is important to consider whether certain words may be viewed as biased or potentially offensive to some respondents, as well as the emotional reaction that some words may provoke. For example, in a 2005 Pew Research Center survey, 51% of respondents said they favored “making it legal for doctors to give terminally ill patients the means to end their lives,” but only 44% said they favored “making it legal for doctors to assist terminally ill patients in committing suicide.” Although both versions of the question are asking about the same thing, the reaction of respondents was different. In another example, respondents have reacted differently to questions using the word “welfare” as opposed to the more generic “assistance to the poor.” Several experiments have shown that there is much greater public support for expanding “assistance to the poor” than for expanding “welfare.”

We often write two versions of a question and ask half of the survey sample one version of the question and the other half the second version. Thus, we say we have two  forms  of the questionnaire. Respondents are assigned randomly to receive either form, so we can assume that the two groups of respondents are essentially identical. On questions where two versions are used, significant differences in the answers between the two forms tell us that the difference is a result of the way we worded the two versions.

One of the most common formats used in survey questions is the “agree-disagree” format. In this type of question, respondents are asked whether they agree or disagree with a particular statement. Research has shown that, compared with the better educated and better informed, less educated and less informed respondents have a greater tendency to agree with such statements. This is sometimes called an “acquiescence bias” (since some kinds of respondents are more likely to acquiesce to the assertion than are others). This behavior is even more pronounced when there’s an interviewer present, rather than when the survey is self-administered. A better practice is to offer respondents a choice between alternative statements. A Pew Research Center experiment with one of its routinely asked values questions illustrates the difference that question format can make. Not only does the forced choice format yield a very different result overall from the agree-disagree format, but the pattern of answers between respondents with more or less formal education also tends to be very different.

One other challenge in developing questionnaires is what is called “social desirability bias.” People have a natural tendency to want to be accepted and liked, and this may lead people to provide inaccurate answers to questions that deal with sensitive subjects. Research has shown that respondents understate alcohol and drug use, tax evasion and racial bias. They also may overstate church attendance, charitable contributions and the likelihood that they will vote in an election. Researchers attempt to account for this potential bias in crafting questions about these topics. For instance, when Pew Research Center surveys ask about past voting behavior, it is important to note that circumstances may have prevented the respondent from voting: “In the 2012 presidential election between Barack Obama and Mitt Romney, did things come up that kept you from voting, or did you happen to vote?” The choice of response options can also make it easier for people to be honest. For example, a question about church attendance might include three of six response options that indicate infrequent attendance. Research has also shown that social desirability bias can be greater when an interviewer is present (e.g., telephone and face-to-face surveys) than when respondents complete the survey themselves (e.g., paper and web surveys).

Lastly, because slight modifications in question wording can affect responses, identical question wording should be used when the intention is to compare results to those from earlier surveys. Similarly, because question wording and responses can vary based on the mode used to survey respondents, researchers should carefully evaluate the likely effects on trend measurements if a different survey mode will be used to assess change in opinion over time.

Question order

Once the survey questions are developed, particular attention should be paid to how they are ordered in the questionnaire. Surveyors must be attentive to how questions early in a questionnaire may have unintended effects on how respondents answer subsequent questions. Researchers have demonstrated that the order in which questions are asked can influence how people respond; earlier questions can unintentionally provide context for the questions that follow (these effects are called “order effects”).

One kind of order effect can be seen in responses to open-ended questions. Pew Research Center surveys generally ask open-ended questions about national problems, opinions about leaders and similar topics near the beginning of the questionnaire. If closed-ended questions that relate to the topic are placed before the open-ended question, respondents are much more likely to mention concepts or considerations raised in those earlier questions when responding to the open-ended question.

For closed-ended opinion questions, there are two main types of order effects: contrast effects ( where the order results in greater differences in responses), and assimilation effects (where responses are more similar as a result of their order).

An example of a contrast effect can be seen in a Pew Research Center poll conducted in October 2003, a dozen years before same-sex marriage was legalized in the U.S. That poll found that people were more likely to favor allowing gays and lesbians to enter into legal agreements that give them the same rights as married couples when this question was asked after one about whether they favored or opposed allowing gays and lesbians to marry (45% favored legal agreements when asked after the marriage question, but 37% favored legal agreements without the immediate preceding context of a question about same-sex marriage). Responses to the question about same-sex marriage, meanwhile, were not significantly affected by its placement before or after the legal agreements question.

Another experiment embedded in a December 2008 Pew Research Center poll also resulted in a contrast effect. When people were asked “All in all, are you satisfied or dissatisfied with the way things are going in this country today?” immediately after having been asked “Do you approve or disapprove of the way George W. Bush is handling his job as president?”; 88% said they were dissatisfied, compared with only 78% without the context of the prior question.

Responses to presidential approval remained relatively unchanged whether national satisfaction was asked before or after it. A similar finding occurred in December 2004 when both satisfaction and presidential approval were much higher (57% were dissatisfied when Bush approval was asked first vs. 51% when general satisfaction was asked first).

Several studies also have shown that asking a more specific question before a more general question (e.g., asking about happiness with one’s marriage before asking about one’s overall happiness) can result in a contrast effect. Although some exceptions have been found, people tend to avoid redundancy by excluding the more specific question from the general rating.

Assimilation effects occur when responses to two questions are more consistent or closer together because of their placement in the questionnaire. We found an example of an assimilation effect in a Pew Research Center poll conducted in November 2008 when we asked whether Republican leaders should work with Obama or stand up to him on important issues and whether Democratic leaders should work with Republican leaders or stand up to them on important issues. People were more likely to say that Republican leaders should work with Obama when the question was preceded by the one asking what Democratic leaders should do in working with Republican leaders (81% vs. 66%). However, when people were first asked about Republican leaders working with Obama, fewer said that Democratic leaders should work with Republican leaders (71% vs. 82%).

The order questions are asked is of particular importance when tracking trends over time. As a result, care should be taken to ensure that the context is similar each time a question is asked. Modifying the context of the question could call into question any observed changes over time (see  measuring change over time  for more information).

A questionnaire, like a conversation, should be grouped by topic and unfold in a logical order. It is often helpful to begin the survey with simple questions that respondents will find interesting and engaging. Throughout the survey, an effort should be made to keep the survey interesting and not overburden respondents with several difficult questions right after one another. Demographic questions such as income, education or age should not be asked near the beginning of a survey unless they are needed to determine eligibility for the survey or for routing respondents through particular sections of the questionnaire. Even then, it is best to precede such items with more interesting and engaging questions. One virtue of survey panels like the ATP is that demographic questions usually only need to be asked once a year, not in each survey.

U.S. Surveys

Other research methods, sign up for our weekly newsletter.

Fresh data delivered Saturday mornings

1615 L St. NW, Suite 800 Washington, DC 20036 USA (+1) 202-419-4300 | Main (+1) 202-857-8562 | Fax (+1) 202-419-4372 |  Media Inquiries

Research Topics

• Age & Generations
• Coronavirus (COVID-19)
• Economy & Work
• Family & Relationships
• Gender & LGBTQ
• Immigration & Migration
• International Affairs
• Internet & Technology
• Methodological Research
• News Habits & Media
• Non-U.S. Governments
• Other Topics
• Politics & Policy
• Race & Ethnicity
• Email Newsletters

ABOUT PEW RESEARCH CENTER  Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research. Pew Research Center does not take policy positions. It is a subsidiary of  The Pew Charitable Trusts .

Copyright 2024 Pew Research Center

Terms & Conditions

Privacy Policy

Cookie Settings

Reprints, Permissions & Use Policy

• Trending Now
• Foundational Courses
• Data Science
• Practice Problem
• Machine Learning
• System Design
• DevOps Tutorial
• Top 10 ChatGPT Prompts for Maximizing Legal Research Efficiency
• Legal Risk in Business: Meaning, Types and FAQs
• Types of Contracts Based on Validity
• 10 Best AI Tools for Lawyers (Free + Paid)
• 10 Most Useful Websites for Law Students
• Top 10 Female Lawyers in India
• 10 Books Every Lawyer Must Read
• Best Law Schools in the United States
• List of 5 Law Internships for Students
• How to Become a Lawyer: A Comprehensive Guide
• Judicial Activism: Definition and Types
• 10 Must-Have Apps for Law Students
• 7 Best AI Tools for Contract Drafting
• 10 Best Certificate Courses for Law Students in India
• Top 7 Career Options in Law in India
• List of 10 Largest Law Firms in the World
• Judiciary and Rights Polity Class 11 Notes
• Professional Ethics in Law: Legal Framework and Advantages
• List of 10 Most Famous Lawyers in USA

Types of Legal Research

Legal research is like detectives’ work for lawyers. They search for information about laws, court cases, and legal rules to find answers to their questions. This helps them understand the law better, solve legal problems, and make strong arguments in court. Lawyers need to do this research so they can give good advice to their clients and write legal papers correctly.

Table of Content

1. Descriptive Legal Research

2. quantitative legal research, 3. qualitative legal research, 4. analytical legal research, types of legal research- faqs.

Descriptive legal research is about summarizing legal concepts, laws, or court cases without going into deep analysis. It’s like providing an overview of legal topics, explaining them clearly without getting too detailed. This type of research helps in understanding the basics of legal issues, setting the stage for more in-depth exploration. Instead of dissecting legal principles, descriptive research straightforwardly presents them, making it easier for readers to grasp complex legal ideas without getting overwhelmed by complexity.

For example, if a law student provides a summary of a Supreme Court decision, it’s descriptive legal research

Features of Descriptive Legal Research:

• Descriptive legal research condenses intricate legal concepts, statutes, or case law into straightforward summaries, making them understandable for non-experts.
• This type of research prioritizes clarity by simplifying legal language and removing unnecessary jargon, ensuring that the information is easily accessible to a wide audience.
• Descriptive legal research aims to present legal information objectively, without introducing personal opinions or biases, allowing readers to form their own interpretations.

Advantages of Descriptive Legal Research:

• Descriptive legal research makes legal concepts accessible to individuals without formal legal training, such as clients, policymakers, or the general public, facilitating a better understanding of legal issues.
• It provides a foundational understanding of legal topics, acting as a starting point for further exploration or analysis, aiding individuals in quickly grasping key concepts.
• Descriptive legal research is a time-efficient method for obtaining basic legal information, saving individuals from diving into lengthy legal texts or conducting extensive analyses.

Disadvantages of Descriptive Legal Research:

• Descriptive legal research may lack depth, offering only a surface-level understanding of legal topics without providing thorough analysis or insights.
• It often presents legal information in isolation, without providing broader contextualization or analysis of how legal principles apply in specific situations or contexts.
• Simplifying complex legal concepts for accessibility purposes can sometimes result in oversimplification, potentially overlooking important nuances or exceptions and leading to misunderstandings.

Quantitative legal research involves analyzing numerical data related to legal matters. By using statistical methods, they identify correlations and trends within legal data, providing objective insights into legal issues. This method offers a systematic approach to understanding the empirical aspects of the law, contributing valuable insights to the legal field.

For example, An example of quantitative legal research is studying court records to analyze sentencing trends based on demographic factors like race or gender.

Features of Quantitative Legal Research:

• Quantitative legal research involves measuring and analyzing legal phenomena using numerical data. Researchers collect quantitative data like case counts or court decisions to study patterns within the legal system.
• This research relies on statistical methods such as regression analysis or hypothesis testing to analyze legal data and identify relationships or trends.
• Quantitative legal research emphasizes objectivity in data collection and analysis, relying on empirical evidence rather than subjective interpretation.

Advantages of Quantitative Legal Research:

• It offers an objective approach to studying legal issues, enhancing credibility by relying on empirical data rather than personal biases.
• By studying representative samples, researchers can make generalizations about legal phenomena, applying findings to broader contexts.
• Quantitative research can predict future legal outcomes based on historical data, informing decisions and projections.

Disadvantages of Quantitative Legal Research:

• Quantitative research may oversimplify complex legal issues, potentially overlooking qualitative aspects.
• Challenges in data availability and quality can affect the reliability and validity of research findings.
• While identifying correlations, establishing causality remains challenging, as other factors may influence outcomes.

Qualitative legal research dives deep into legal matters by closely examining non-numerical data. Researchers employ methods like interviews, observations, and textual analysis to gain in-depth insights into the thoughts, experiences, and perspectives of those involved in the legal system. This approach focuses on understanding the broader context surrounding legal issues and seeks to reveal the social, cultural, and psychological factors that shape legal processes and results.

For example, An example of qualitative legal research is interviewing individuals involved in a court case to understand their experiences and perspectives. Researchers analyze the interview data to uncover the social and psychological factors that influence legal outcomes.

Features of Qualitative Legal Research:

• Qualitative legal research involves thoroughly examining legal issues by exploring non-numerical data. Researchers aim to understand the underlying meanings, experiences, and perspectives of legal actors through detailed investigation.
• This method relies on qualitative data collection techniques such as interviews, observations, and textual analysis. Researchers gather rich and contextual data to gain insights into the social, cultural, and psychological factors influencing legal processes.
• Researchers analyze the social, political, and economic factors shaping legal phenomena, providing a holistic understanding of law’s complexities.

Advantages of Qualitative Legal Research:

• Qualitative legal research provides detailed insights by capturing diverse perspectives and experiences of legal actors.
• This method enables researchers to grasp legal issues within their broader socio-cultural and historical contexts, offering nuanced insights into law’s societal operations.
• Qualitative research methods offer adaptability in data collection and analysis. Researchers can tailor their approaches to research questions, exploring emerging themes in depth.

Disadvantages of Qualitative Legal Research:

• Qualitative research is subjective, involving interpretation of subjective data such as interviews. Researchers’ biases may influence analysis and findings, affecting research validity.
• Qualitative research demands significant time and resources due to detailed data collection and analysis. Conducting interviews, transcribing recordings, and analyzing qualitative data are labor-intensive tasks.
• Qualitative research findings may not easily generalize to broader contexts. Focusing on specific cases limits applicability to other settings or situations.

Analytical legal research means carefully looking at legal rules, laws, or court decisions to understand them better. It’s not just about describing them simply; it’s about figuring out why they exist, what they mean, and how they’re used. Researchers study legal arguments, find patterns or problems in the reasoning, and think about what it all means for the law. This helps make the law better over time.

For example, An example of analytical legal research is examining multiple court decisions on a particular legal issue to identify patterns or inconsistencies in judicial reasoning. Researchers critically assess legal arguments to gain insights into legal principles and their applications.

Features of Analytical Legal Research:

• Analytical legal research involves critically examining legal principles, statutes, or court decisions. Researchers delve deep into legal texts to understand underlying reasoning, identify inconsistencies, and uncover hidden implications.
• This method goes beyond surface-level description, focusing on detailed analysis of legal concepts. Researchers scrutinize legal arguments, dissecting them to uncover underlying assumptions.
• Analytical legal research involves synthesizing information from various legal sources to develop comprehensive insights into legal issues.

Advantages of Analytical Legal Research:

• Analytical legal research provides a sophisticated understanding of legal principles and concepts. By critically analyzing legal texts, researchers gain insights into the complexities of the law.
• This method offers a strategic advantage to legal practitioners and scholars by enabling them to anticipate potential legal challenges or counterarguments. By identifying weaknesses or gaps in legal arguments, researchers can develop more robust and persuasive legal strategies.
• Analytical legal research contributes to the development and evolution of legal principles and practices. By uncovering inconsistencies or gaps in legal reasoning, researchers highlight areas for reform or clarification, shaping the development of the law over time.

Disadvantages of Analytical Legal Research:

• Analytical legal research can be time-consuming due to the complex analysis required. Researchers must carefully examine legal texts, identify relevant sources, and synthesize complex information, which can be labor-intensive and time-consuming.
• The interpretation of legal texts in analytical legal research is inherently subjective. Researchers’ biases, perspectives, or interpretations may influence the analysis and conclusions, potentially leading to subjective or contested interpretations.
• Analytical legal research can be hard because legal reasoning and arguments are complicated. Researchers have to read complex legal documents and understand difficult language and detailed arguments. This can be tough, especially for new researchers.

In conclusion, legal research is crucial for navigating the intricacies of the law. Through various methods like descriptive, quantitative, qualitative, and analytical research, scholars and practitioners unravel legal complexities and inform decision-making. Each approach offers distinct advantages and challenges, enriching our understanding of legal matters. By embracing diverse research methodologies, legal professionals can develop informed strategies and contribute to the evolution of legal principles. This ensures fairness and justice in society, ultimately strengthening the rule of law.

What is legal research?

Legal research means looking up laws, rules, past court decisions, and legal principles to find answers to legal questions. It’s like detectives’ work for lawyers, helping them build strong cases, give good advice, and write legal papers.

Why is legal research important?

Legal research helps lawyers give the right advice, make strong arguments in court, and write legal papers correctly. It ensures that lawyers understand complex legal problems and keep the legal system fair and honest.

What are the different types of legal research?

There are different ways to do legal research. Some methods include summarizing legal ideas, studying numbers related to legal issues, exploring people’s experiences in the legal system, and deeply analyzing legal concepts.

How do I do legal research?

Legal research involves using legal databases, libraries, and online sources to find the right legal information. Researchers use keywords, laws, case names, or references to find what they need, and then they study and put together the information to answer legal questions.

What problems can I face when doing legal research?

Legal research can take a lot of time and can be hard because there’s so much legal information to go through. Also, it can be tricky to make sure the information you find is correct and reliable, as it can change depending on where you are or what the situation is.

Note: The information provided is sourced from various websites and collected data; if discrepancies are identified, kindly reach out to us through comments for prompt correction.

Please Login to comment...

Similar reads.

• Law-Types of
• Legal Studies

Improve your Coding Skills with Practice

What kind of Experience do you want to share?