Sending user surveys to your customers is probably the only reliable way to improve your technical documents.
Let’s assume the document you are trying to improve is the help file. Here is a sample question and possible multi-choice-answers:
SAMPLE QUESTION: How frequently have you used the [XYZ] help file within the last year?
POSSIBLE MULTI-CHOICE ANSWERS:
- Once a month
- Couple times a year
- Once a year
Write. Test. Update.