The primary objective of an engagement supervisor’s review of key activities during the engagement is to ensure that all work performed meets acceptable quality standards. This includes verifying that audit procedures were appropriately executed, audit evidence is properly documented, and audit conclusions are supported. The supervisor's review is crucial for maintaining the integrity and reliability of the audit process, ensuring compliance with internal audit standards and protocols.

IIA Standard 2340: Engagement Supervision

IIA Practice Guide: Quality Assurance and Improvement Program