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

Which formula step was difficult?
What error explanation helped?
What task needs more practice?

Author notes / illustrative keys where applicable:
1. Read for step friction. Keep the specific explanation in the respondent’s own words rather than converting it into an unexplained overall satisfaction score.
2. Read for error guidance. Keep the specific explanation in the respondent’s own words rather than converting it into an unexplained overall satisfaction score.
3. Read for practice need. Keep the specific explanation in the respondent’s own words rather than converting it into an unexplained overall satisfaction score.