Questionnaires (aka surveys) are a method of gathering data for research. They can also be used for various assessment purposes. There can be used in any field of psychology or any other area. They also can cover any sort of topic.
With writing and characters it can be interesting to think about how your characters may answer various questionnaires. For some of my characters I've taken the Myers-Briggs Type Indicator (MBTI) answering the questions as my characters would. Figuring out how my characters would answer the questions helps me to get to know them better. Plus to taking it for multiple characters lets me see what range of types I have within my cast of characters. I linked to this awhile back, but here is a handy blog post (Plot to Punctuation) that really has some nice examples of using the MBTI.
As I was struggling to think of a Q post I started thinking that it would have been fun to blog about Q from Star Trek. Though I was able to get a Q that fit into my topic.
Sunset, Kramper Lake at Danish Alps
14 hours ago