Marking questions in a survey as mandatory

If you mark a question Mandatory, respondents cannot submit the survey until they have answered the question.

1. On the Layout/Questions tab, click the Edit button.
2. Select the Mandatory check box beside the questions you want to force respondents to answer.
3. Click Save (not Save Survey).

Notes  

Mandatory questions cannot be used in conjunction with the Prevent Moving Backwards setting.

Mandatory questions cannot be used with branching.