By the end of this lesson you can
- Plan and run diary studies and contextual inquiry.
- Combine qualitative and quantitative methods.
- Choose methods for complex research questions.
The idea
Interviews and usability tests answer many questions, but some need deeper or longer research.
Diary studies
Participants record experiences over days or weeks, using an app, messages or forms. Useful for behaviours that happen over time, such as managing a long-term health condition or planning a holiday. Give clear prompts, check in regularly and reward participation fairly.
Contextual inquiry
You observe and talk with people in their own environment while they do real tasks, using a master-apprentice approach: they show, you ask. It reveals workarounds, interruptions and tools that interviews miss.
Mixed methods
Combine qualitative ("why") and quantitative ("how many") research. For example: analytics show where people drop off; interviews explain why; a survey measures how common each reason is.
Other methods
Card sorting and tree testing for structure, longitudinal studies, field experiments and participatory design workshops.
Ethics
Longer and in-context studies are more intrusive. Get informed consent, protect privacy, allow withdrawal at any time and take care with sensitive topics.
Why it matters in real projects
Complex products and services involve behaviours that unfold over time and in context. Advanced methods uncover what basic interviews miss. Mixed methods give both depth and confidence, making findings more persuasive to stakeholders and more reliable for decisions.
A realistic example
A team designing a medication app runs a two-week diary study with 10 people. Entries reveal that doses are often missed at weekends, when routines change. Contextual visits show pill boxes kept in kitchens, not bedrooms. A follow-up survey of 400 users confirms weekend misses are common. The team designs routine-based reminders instead of fixed times.
Step by step
Frame the question
Decide what you need to learn and why basic methods are not enough.
Choose methods
Pick diary, contextual or mixed methods.
Plan logistics
Set duration, prompts, tools and incentives.
Address ethics
Plan consent, privacy and withdrawal.
Run and monitor
Check in and keep participants engaged.
Synthesise and triangulate
Combine findings across methods.
Common mistakes
Mistake Diary studies with vague prompts.
Instead Give clear, specific prompts.
Mistake Relying on interviews for workplace behaviour.
Instead Observe in context.
Mistake Quantitative data without explanation.
Instead Combine with qualitative research.
Check your understanding
Choose an answer, then check it. There is an explanation either way.
Practice exercise
Exercise · about 45 min
Research plan
Plan a mixed-methods study.
Steps
- Choose a complex research question.
- Select two or three methods and explain why.
- Plan logistics and ethics.
- Describe how you will combine findings.
Deliverable
A mixed-methods research plan.
Self-assessment
Tick each item when it is true of your exercise. Be honest; this is for you.
4 items
Summary
- Diary studies capture behaviour over time.
- Contextual inquiry reveals real environments.
- Mixed methods combine why and how many.
- Take extra care with ethics.
Further reading
Third-party sources, chosen for reliability. They open in a new tab.
- Diary studies (opens in a new tab)Nielsen Norman Group
- Contextual inquiry (opens in a new tab)Nielsen Norman Group
- UX research cheat sheet (opens in a new tab)Nielsen Norman Group
Your notes
Marking complete updates your course and roadmap progress.