Lesson 17 — Usability Testing Cheat Sheet

UI/UX

In one line: Watch real people attempt real tasks — 5 users typically surface about 85% of usability problems.

Core Concepts

1Task-based testing. Give a realistic goal, not a design opinion question.

2Think-aloud. Participant narrates thoughts while working.

35-user rule. ~5 users surface ~85% of usability problems (NN/g).

4Iterative rounds. Test 5, fix, test 5 more > test 15 once.

Bad: "Was that easy to find?"

Leading — biases the answer

Good: "What would you do next?"

Neutral — reveals actual behavior