Guides
Why 5 Users Find 85% of Usability Problems (Nielsen Norman's Rule Explained)
Nielsen Norman Group research shows 5 users surface 85% of usability problems on a single flow. Here is when that 5-user rule works — and when you need more.
UX Survey Questions by Product Decision and Trigger
Use targeted UX survey questions by trigger, decision, and product moment, with examples that avoid leading or noisy feedback.
