Qualitative research relies on direct conversations and observations to uncover the motivations, behaviours, and pain points that numbers alone cannot reveal. The most common conversational method is the user interview, a one-on-one discussion with a current or potential user to understand their needs, behaviours, and context. Interviews come in three forms: structured, where every participant is asked the same fixed questions; semi-structured, which follows a guide but allows flexible probing; and unstructured, which takes the form of an open exploratory conversation. Best practice is to ask open-ended questions, avoid leading questions that suggest a preferred answer, and listen more than you talk, aiming for roughly an 80/20 listen-to-talk ratio so the participant does most of the talking.
A useful rule of thumb is that five to eight interviews per user segment will typically reveal around 80% of usability issues, based on Nielsen's research on diminishing returns. Leading questions such as "Don't you think this feature is easy?" bias responses, so a researcher would instead ask neutrally, "How was your experience with this feature?" To bring research even closer to reality, contextual inquiry involves observing and interviewing users in their natural environment while they perform tasks, combining observation with dialogue to surface tacit knowledge that interviews alone miss. When researchers need to understand behaviours over time, habits, or infrequent events, they turn to diary studies, in which participants log their experiences, activities, and thoughts over days or weeks using a journal, app, or photographs.
Several synthesis tools help teams make sense of qualitative data. An empathy map is a collaborative canvas that captures what a user says, thinks, does, and feels, building shared understanding across a team. An affinity diagram organises qualitative data by grouping related ideas, quotes, and observations on sticky notes into clusters that reveal themes, while thematic analysis is the broader qualitative method for identifying recurring patterns across interview transcripts and diary studies. Researchers also conduct task analyses, breaking down user goals into discrete steps and sub-tasks to understand the actions, decisions, and information needed to complete a workflow. Throughout this work, recruiting the right people is essential: a screener survey is a short questionnaire used to filter and select participants who match the target user profile, and participant recruitment more broadly is the process of finding users who represent the target audience so that findings remain valid and reliable. Finally, a research repository acts as a centralised collection of all research findings, insights, and artefacts, making past work discoverable and avoiding duplicate studies.