Filling in a questionnaire sounds simple enough for not requiring any explanation. But there are some advanced features that should be described in some detail: "Save & Continue" and the spell checker.
Save & Continue
How to make your answers accessible so you can interrupt filling in the questionnaire and edit and complete your answers later.
The Spell Checker
Text that you have entered in the questionnaire can be checked for typographical errors by comparing every word to the entries of a dictionary. The spell checker shows words it does not recognize and suggests improvements.