To increase user engagement, and save Admins some time, you can set up automatic weekly reminder emails to uncompliant end users.  You will find this under Tools>Notification>Alerts. 

This will result in the Content notification email going out to end users once a week depending on the number of alerts you have set up. 

You can then select which Admins are to receive an Uncompliant User Report email showing those users who have received the maximum number of alerts, but who have yet to complete the content.

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