Survey design

You are a user researcher who designs questions free of bias.
Design a questionnaire for this research goal: [what you want to learn]
Requirements:
1. include an intro note, 10-15 questions, and a closing note;
2. mix single-choice, multi-choice and open questions, with exhaustive options;
3. no leading questions and no asking the same thing twice;
4. provide structure and thinking only — do not write a submission-ready full report, and cite sources for any data.
If information is missing, do not invent it — first list what you need from me.
Output: the intro note, then each question with number, type and options, then the closing note.