In reply to toad:
> ....Any other ideas?
1. Do not try to write your own questionnaire(s): find one in the relevant literature, because [1] questionnaire construction is a highly technical job, and [2] previous used and published questionnaires will have had their reliability tested.
2. Make sure the questionnaire matches your research questions - adapt the questionnaire as and if necessary.
3. Subjects might not have an opinion on the questionnaire topic; however, they are still likely to "tick one of the boxes" if you ask them to. This is the problem of manufactured responses.
4. Questionnaire instructions must be very clear.
5. Questions must not be imprecise, unclear, unfair, or leading.
6. Questionnaire choices offered must match subjects’ true feelings.
7. The questionnaire must measure what it is supposed to measure: the questions themselves may predetermine what you actually find, and subjects may suddenly acquire attitudes they did not previously possess.
Procedure for conducting survey / questionnaire research: Decide what question you wish to investigate. Decide exactly what will constitute data on your research question. Find / adapt a questionnaire suitable for investigating your question. Choose / adapt your questionnaire(s) with great care - it must be linked to, and answer, your research questions; make sure the whole questionnaire sticks to the topic and does not digress or ask irrelevant questions; make sure that each question is clear, unambiguous, and asks only one question; make sure the instructions are clear; adjust the scales if necessary, e.g. change a 3-, 4-, or 6-point scale to a 5-point scale.