Interns are your future hires, and they tell other students what it was like. Ask them at the end of the internship what the work was like, whether they learned anything and whether they'd come back, then fix what puts the next group off.
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The work
Supervision
Learning
Culture
Overall
7 questions selected
Tips for a better internship feedback survey
Ask in the last week, before they leave and lose interest.
Read the supervision answers closely; a poor supervisor is the usual reason an internship goes badly.
Pass the best interns' answers to whoever runs graduate hiring.