Qualitative vs. quantitative research: when and how to use each method
Learn the key differences between qualitative and quantitative research, and when to use them for your next study.
How familiar are you with the difference between qualitative and quantitative research methods?
If you write down your answer or explain it to someone, you provide qualitative data. Your answer is descriptive, not quantifiable or measurable.
Now take a look at this list of predefined answers:
- Extremely familiar
- Moderately familiar
- Somewhat familiar
- Slightly familiar
- Not at all familiar
You provide quantitative data if you choose an answer option instead of describing it in your own words. Your answer can be assigned a numeric value, measured, and expressed as a percentage or other data point.
Which research method is better? It depends on your research goals and what you want to do with the data you collect.
Keep reading to learn about the key differences between quantitative vs. qualitative questions, their strengths and limitations, and get examples of how they can work together.
Understanding qualitative vs. quantitative data: What’s the difference?
What is qualitative research?
Qualitative research is a type of first-hand observation where researchers focus on understanding human behaviors, motivations, and emotions. The most common types of qualitative research are interviews, focus groups, and surveys that ask for written responses.
Definition of qualitative data and key characteristics
- Qualitative research participants write down their answers, like in textbox survey questions. In a focus group or interview, participants may verbally respond to questions. The qualitative data you collect are most often words, not numbers.
- As a researcher, you might conduct a series of one-on-one interviews or focus groups. Your datasets will likely be smaller because you’re focused on the thoughts of a few people at a time.
- You can visualize qualitative data using a word cloud, emphasizing certain trends by word size. You can also highlight impactful or insightful participant quotations.
- Qualitative data are subjective, meaning they’re individual thoughts, feelings, and judgments that can’t be generalized to a population.
What is quantitative research?
Quantitative research is a type of data collection where researchers focus on taking measurements, making predictions, and validating hypotheses. The most common types of quantitative research are surveys, experiments, studies, and data analysis.
Definition of quantitative data and key characteristics
- Survey participants choose from predefined or closed-ended answer options. As a researcher, you can assign numerical values to these answer responses or look at percentages.
- You might observe participants over time if you’re running an experiment or performing a study. The quantitative data you collect is numerical or measurable.
- Because you’re collecting numeric data, you can easily create graphs and charts. You can also track data trends and filter and compare the numbers for analysis.
- Overall, the quantitative data are objective, meaning they’re less subject to certain types of bias and personal feelings.
Strengths and limitations of qualitative and quantitative data
Let’s say you’re running market research to develop a new product. Should you conduct qualitative or quantitative research? It depends on your research goal and your available resources. To help you decide, here are the strengths and limitations of both quantitative and qualitative research.
| Research type | Strengths | Limitations |
| Qualitative (Interviews, focus groups, write-in survey responses) | -Allows researchers to ask follow-up questions and clarify answers -Gives context to your performance metrics, like website visits or product returns -Captures subjective insights that can help you uncover unique perspectives, new ideas, and themes -Helps you understand more intangible concepts like company culture or unmet needs | -Because the data are text-based, they can be difficult to analyze -Can be costly and time-consuming -Unlikely that you’ll reach a large enough sample size for statistical significance -Run the risk of drawing conclusions that aren’t representative of the needs of your target population |
| Quantitative (Surveys with predefined answer options, studies, experiments, data analysis) | -Provides numerical and statistical data for analysis -Able to generalize findings from a large sample size -Benchmark data and track metrics over time -Can be more cost effective, scale more easily -Certain types of quantitative research, like surveys, can be less time consuming and costly | -Doesn’t capture the “why” behind the data -Even carefully designed quantitative studies and research can be prone to sampling bias -Larger, time-based studies can take years to complete and be costly |
How to combine qualitative and quantitative research methods
Because of the difference between quantitative and qualitative data, you can use both to complement each other. Here’s how to mix research methods for a more holistic understanding of your research topic.
Mixed methods research explained
- Mixed methods research (MMR) is when researchers combine both qualitative and quantitative questions in their primary research.
- By combining both types of research, you can get the “what” or numbers, which help you take measurements and easily track trends. The qualitative questions can help you give context or the “why” behind the quantitative data.
- For example, you might conduct a longitudinal study in which you send a survey to the same customers every month over a year. At the end of the study, you might interview a few participants to gain deeper insights about why they responded the way they did.
Examples of using qualitative and quantitative survey questions
Surveys are a great tool for performing mixed methods research. When you create a survey, you can easily include both open-ended and closed-ended survey questions for better insights. Here’s how to take advantage of the difference between qualitative and quantitative research with examples.
Give context to your data benchmarks and trends
Whether measuring employee engagement or customer loyalty, you probably use the Net Promoter ScoreⓇ (NPS). You might want to consider adding it to your research if you're not. That’s because NPS is an industry standard many organizations use to track performance.
The question, “How likely is it that you would recommend our product to a friend or colleague,” provides quantitative data.
Let’s say your NPS is 70 one month and 60 the next. Because you benchmark and track your NPS, you know you’ve got issues to address, but where do you start? Luckily, you use survey logic to ask customers who gave you a lower rating to explain their answers:
Understand the “why” behind your numbers
There are many survey rating scales, from stars to smiley faces and beyond. Many answer options also include word scales, where someone can choose their level of agreement, satisfaction, or just about anything else.
Although some answer options might seem subjective, they result in quantitative data you can chart, track, and analyze. Here’s an example from our Employee Satisfaction Survey Template:
Of course, “strongly disagree” or “strongly agree” is an opinion. But these answer options can be broken down into percentages or raw numbers. For example, 59% of survey participants agreed they were satisfied with the workplace culture.
Numbers only tell part of the story; you can use open-ended questions for more context. For example, how do you know if 59% is good or bad? Maybe if you compared it to the year before, and it’s higher, that’s good. But why?
Ask a question like, “Describe your experience in the workplace,” to fill in some details. The answers you get could influence your next steps.
Qualitative and quantitative data analysis tips
- Carefully consider your sample size or the number of people in your study. This will help you determine whether or not you can confidently generalize your findings to the total population you’re studying.
- Use software tools that can help you visualize and interpret your qualitative data, like text analysis.
- Ensure you’re using your quantitative methods effectively. For example, if you’re trying to understand the purchase habits of your target market, include demographic questions. For more diverse populations, you can perform a deeper analysis of how different demographic groups responded to your questions.
- Remember that your results are only as good as your questions. Before you start, ensure you know how to write effective research questions. This will help you create clear, unbiased questions that yield reliable data. To save time, you can use our customizable survey questions and templates written by experts.
Conduct your research with confidence
Know the questions to ask and how to understand the answers you get. Our survey templates and features will make your next project a success.
Appendix: Qualitative and quantitative question examples
Customer satisfaction
Check out our customer satisfaction survey templates or take a look at these examples:
Quantitative questions
Overall, how satisfied or dissatisfied are you with our company?
- Very satisfied
- Somewhat satisfied
- Neither satisfied nor dissatisfied
- Somewhat dissatisfied
- Very dissatisfied
Which of the following words would you use to describe our products? Select all that apply.
- Reliable
- High quality
- Useful
- Unique
- Good value for money
- Overpriced
- Impractical
- Ineffective
- Poor quality
- Unreliable
How much time did it take us to address your questions and concerns?
- Much shorter than expected
- Shorter than expected
- About what I expected
- Longer than expected
- Much longer than expected
Qualitative questions
- Do you have any other comments, questions, or concerns?
- What changes would this company have to make for you to give it an even higher rating?
- Do you have any other comments about how we can improve our website?
- Do you have any thoughts on how to improve this software?
- Please help us understand why you selected the answer above.
Market research
Check out our market research survey templates or take a look at these examples:
Quantitative
How familiar are you with our brand?
- Extremely familiar
- Very familiar
- Somewhat familiar
- Not so familiar
- Not at all familiar
When was the last time you used this product category?
- In the last week
- In the last month
- In the last 3 months
- In the last 6 months
- In the last 12 months
- More than 12 months ago
- Never
Thinking about the logo overall, which of the following best describes your feelings about it?
- Like it very much
- Like it somewhat
- Feel neutral about it
- Dislike it somewhat
- Dislike it very much
Qualitative
- When you think of this product type, what brands come to mind?
- In your own words, what are things that you would most like to improve in this new product?
- What types of products do you typically buy online?
- What changes would most improve competing products currently available from other companies?
- What first comes to mind when you look at the logo?
Employee feedback
Check out our employee feedback survey templates or take a look at these examples:
Quantitative
How good is the quality of this employee’s work?
- Extremely good
- Very good
- Somewhat good
- Not so good
- Not at all good
I am satisfied with my opportunities for professional growth.
- Strongly disagree
- Disagree
- Neutral/Neither agree nor disagree
- Agree
- Strongly agree
How happy or unhappy are you with your current role at your job?
- Very happy
- Somewhat happy
- Somewhat unhappy
- Very unhappy
Qualitative
- What can we do to improve the recruiting process at our company?
- What’s your favorite project you’ve ever worked on? Your least favorite?
- What does your supervisor need to do to improve their performance?
- What are your reasons for leaving this company?
Event feedback
Check out our event feedback survey templates or take a look at these examples:
Quantitative
Overall, how would you rate the event?
- Excellent
- Very good
- Good
- Fair
- Poor
How organized was the event?
- Extremely organized
- Very organized
- Somewhat organized
- Not so organized
- Not at all organized
Was the event length too long, too short, or about right?
- Much too long
- Too long
- About right
- Too short
- Much too short
How likely are you to attend this event again in the future?
- Extremely likely
- Very likely
- Somewhat likely
- Not so likely
- Not at all likely
Qualitative
- What did you like about the event?
- What did you dislike about the event?
- Is there anything else you’d like to share about the event?
- How did you hear about this event?
- If you will not be attending this event, please explain why.
- What topics would you most like to learn about or discuss at this event?
Net Promoter, Net Promoter Score, and NPS are trademarks of Satmetrix Systems, Inc., Bain & Company, Inc., and Fred Reichheld.