You can make a question required in a survey. By preventing users from submitting a survey without answering required questions, you can ensure that the information in a survey is complete.
Click Designer Studio > Case Management > Survey to open the Survey Management landing page.
Click the name of a survey, and then click the question that requires an answer.
In the Edit question dialog box, select the Required question check box.
This option is not available for complex questions, however, you can make a complex question required by performing validation on the answers that the user provides at run time.
For more information about validation, see: Validating answers in a survey.
Click Save to close the Edit question dialog box.
Note: You must purchase a separate license before using survey functionality in your application.