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Structured InstrumentInterview
Face-to-Face Questionnaires
An interviewer meets respondents in person, follows a pre-prepared script of questions, and records their answers. The interviewer can clarify questions or probe for more detail during the session.
When This Method Fits
Typical duration
Days – Weeks
Typical cost
Medium
Fidelity level
N/A
Stage
Discovery
Hypothesis type
Desirability
Goal type
Find product-market fit, Deepen product-market fit, Validate go-to-market strategy, Maximize societal impact
Randomization
N/A
Study design
Individual case report
Minimum units needed
30
Causal rigor
Min 1 · Max 1 / 5
1Best Fit When
Best when you need structured, comparable data from a population that's hard to reach via digital channels, or where in-person rapport improves response quality.