Make a question required to ensure that your survey collects complete
information.
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In the header of Dev Studio, click .
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Click the name of a survey, and then click the question that requires an answer.
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In the Question settings section, select the
Required check box.
This option is not available for multi-answer questions, however, you can make a
multi-answer question required by performing validation on the answers that the user
provides at run time.
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Click Save survey.