The primary objective of performing a post-incident review is to identify the root cause of the incident. This information is used to develop and implement corrective actions to prevent similar incidents from occurring in the future. The post-incident review process may also include a re-evaluation of the impact of the incidents, the identification of vulnerabilities, and the identification of control improvements, but the primary objective is to determine the root cause of the incident. By understanding the root cause, the organization can take proactive steps to prevent similar incidents from occurring in the future and improve the overall security posture of the organization.