If nothing was unclear or difficult, say so. Skip questions about steps you did not experience; use not applicable where appropriate.

Which measurement was difficult to interpret?
How did you use the guide?
What example would help?

Author notes / illustrative keys where applicable:
1. A difficult measurement identifies the label or measurement basis users cannot interpret. Explain verified instructions without collecting respondents' body dimensions.
2. The way someone applied the guide identifies which measurements, labels or comparison steps need clearer explanation. Refer to verified instructions, without collecting body measurements or promising that the guide ensures a suitable fit.
3. A useful example identifies the comparison step that needs demonstration. Show accurately labelled dimensions without promising that the guide guarantees fit.