• Personality type (MBTI, Enneagram, etc)
• Occupation
• Time usage (how much time you allocate for it; used for work or for hobby; etc)
• Notations, symbols used
• What changed in your life since using it (this was actually asked by me)

There are some questions I find interesting, including

• Other time managment systems used before (GTD, DIT, etc)
• Satisfaction (perfect, I use it with tweaks, not for me)
• Statistics (tasks done a day – a recurring topic on the forum)
• Use it for something specific (e.g. for writing)
• Do you want to try another system?
• Did you talk any friend into trying it?
• Do you or would you use it in a team setting with co-workers

Feel free to contribute to this list by posting a comment.

• A ten-question general quiz
• A list of items you should know where to find
• Focused on the closet – mostly for women, I guess
• For business people and office workers – a word of warning (not given on the site): you can see the results only after you registered