As a reviewer you can choose to notify the responsible control performer upon completion. To send an email notification to a control performer, simply check "Notify responsible of your review approval" when reviewing a control.
This feature enables the performer to know when the review of their controls is completed.
As a reviewer you can approve a control and still give feedback to the control performer. To add a review comment check "Include review comment in notification" when reviewing the control.
The first reviewer can be notified as well in case of 4-eyes review. To notify the first reviewer check "Notify first reviewer of your review approval" when reviewing the control.