"Allow Retakes" is a great feature that can improve your data quality. It helps you maintain the integrity of your assessments--you can control whether or not your audience can retake an assessment, and if so how often retakes are allowed. This means you can control the quality of your data.
To enable the retake controls, select the "Allow Retakes" option on your "Create/Edit" page. Once you have selected the "Allow Retakes" option, select the frequency you wish to allow retakes from the "Limit" drop-down menu:
Hope you find Retake Controls helpful!