While preparing the questionnaire what points should keep in mind?

While preparing the questionnaire following points should keep in mind :

1. The questionnaire should not be too long. The number of questions should be as minimum as possible.

2. The series of questions should move from general to specific. This helps the respondents feel comfortable.

3. The questions should not be complex. The respondents can answer quickly, correctly and clearly.

4. The questions should not use double negatives. The questions starting with 'wouldn't you' or 'don't you' should be avoided.

5. The question should not be a leading question which gives a clue about how the respondent should answer.

6. The question should not indicate alternatives to the answer.