Qualitative research focuses on understanding why people behave the way they do. It explores motivations, attitudes, emotions, and experiences through methods such as interviews, diary studies, and observation. Quantitative research focuses on measurable data and answers questions about what users do, how often they do it, and how widespread a behavior may be. Together, these methods provide a more complete understanding of user behavior and customer experience.
When to apply qualitative and quantitative research
Foolproof explores the uses of qualitative and quantitative research as well as their respective pros and cons.
User research is a non-negotiable component of experience design
It's what gives us consumer insight which in turn helps us make informed decisions about design.
There are two main types of user research: qualitative and quantitative and of course, there are pros and cons associated with both.
When to deploy either-or depends very much on the design decision you need to make.
What is qualitative research?
Qualitative research methods are used to gather feedback and insights from a relatively small group of users.
In general, qualitative research is answering the; How, When, Where and Why, of user behaviour.
Examples of qualitative methods include: unstructured or semi-structured interviews, ethnography, diary studies, focus groups and co-creation sessions.
Foolproof's qualitative research capabilities
Explore or validate concepts/designs with a small sample (approx. 12-50 participants)
Observe immediate reactions and emotional responses to an experience, including tone of voice, facial expressions and body language
Uncover unexpected pain-points or opportunities to add value in realtime
The limitations of qualitative research
Sample size is limited, therefore lacking the confidence of numbers
Sample obtained is not (statistically) representative of the entire user population
Unstructured methods can lead to inconsistent data capture
What is quantitative research?
Quantitative research methods are also used to gather insights but the size and range of the user group can be expanded.
This type of research focuses more on collecting user “data” as opposed to just insight. In general, quantitative research is answering the “who” and “what” of user behaviour.
Examples of quantitative methods include: structured, unmoderated testing, surveys, and questionnaires.
Foolproof's quantitative research capabilities
Explore or validate concepts and designs with a large sample (approx. 50-1000+ participants)
Capture behavioural data for task-based research, including task completion times, clickpaths, heatmaps, and success or failure scores
Measure satisfaction and usability with standard measures (i.e. System Usability Scale, Net Promoter Score)
The limitations of quantitative research
Unable to probe participants in the moment on their responses or observed behaviour
Lacks moderation; therefore the stimulus presented must be functional for use without assistance from a moderator
Choosing the right research method to inform design decisions
Research methods are not interchangeable and have specific objectives which they are most suitable for.
Choosing the most applicable method will depend on what design decisions need to be made for the creation or refinement of a design.
As a rule of thumb, use qualitative research methods for exploring ideas, designs, or processes which do not require concrete hypotheses or structured, statistically valid feedback.
We have found that qualitative methods are particularly useful for serendipitous discovery and often provide more in-depth insights.
You can use quantitative research methods such as A/B testing for validating or choosing a design based on user satisfaction scores, perceived usability measures, and/or task performance. You will find the insight will be more superficial, but the data is statistically valid and can be generalised to the entire user population.
A combination of qualitative and quantitative research is typically best for most design projects if budget allows.
By using both methods you can achieve a deeper level of insight through the exploratory nature of the research in addition to statistical evidence to support your design decisions.
Using qualitative and quantitative research together answers to the; Who, What, When, Where, Why, and How, of user behaviours and experiences.
Qualitative vs Quantitative Research - FAQs
Qualitative research is most valuable when organizations need deeper insights into customer motivations, decision-making processes, and emotional responses. It is commonly used during discovery phases to uncover unmet needs, identify pain points, and explore new opportunities. Because qualitative research provides rich contextual insights, it is particularly useful when understanding the reasons behind user behavior is more important than measuring it at scale.
Quantitative research is ideal when organizations need statistically significant data from larger groups of users. It is commonly used to measure performance, validate hypotheses, identify trends, and compare options. Surveys, structured testing, and usability metrics can provide evidence that supports design decisions and helps organizations understand how common specific behaviors or opinions are among their audience.
The two approaches complement each other by answering different questions. Qualitative research helps explain why users behave in certain ways, while quantitative research helps determine how frequently those behaviors occur. Combining both methods allows organizations to gain deeper insights and validate findings with larger datasets, resulting in more confident and informed decision-making.
While qualitative research delivers rich insights, it typically involves smaller participant groups that may not fully represent an entire customer population. Findings often reveal patterns and opportunities but cannot always be generalized with statistical confidence. For this reason, organizations sometimes follow qualitative studies with quantitative research to validate findings on a larger scale.
The best research method depends on the decisions that need to be made. If the goal is to understand motivations, behaviors, and unmet needs, qualitative research is often the best choice. If the objective is to measure performance, compare alternatives, or validate findings across a larger audience, quantitative research may be more appropriate. Many successful research programs combine both approaches to generate comprehensive and actionable insights.