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Click on the action link (arrow button) next to the title of the assessment.
Choose Adaptive Release on the menu that appears.
On the next page, choose the appropriate options for the following section (especially membership):
Membership: When users or groups are added to this section, only those selected have access to the content. Users must be specified in the Username list or must be in a selected Group.
Other sections are explained in the Adaptive Release article.
Click Submit.
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