Think-Aloud Protocol

A usability technique where participants voice their thoughts as they use a product, revealing expectations, confusion, and reasoning in real time.

Why it matters

Watching someone struggle tells you where the problem is; hearing them narrate tells you why. 'I'm looking for a way to cancel... maybe under my profile?' is a mental model handed to you verbatim — no analytics event will ever capture it. The discipline is in staying silent: every time you explain, hint, or rescue, you erase the data you came for.

The numbers

5 participants typically expose most usability problems in a round (Nielsen Norman Group)

Related terms

Usability
Diary Study
Card Sorting
Usability Study

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