An information security post-incident review is a process that aims to identify the root causes, impacts, lessons learned, and improvement actions of a security incident. The highest priority during a post-incident review should be evaluating the effectiveness of the incident response, which means assessing how well the incident response plan, procedures, roles, resources, and communication were executed and aligned with the business objectives and requirements. Evaluating the incident response effectiveness can help to identify the gaps, weaknesses, strengths, and opportunities for improvement in the incident response process and capabilities. Documenting actions taken in sufficient detail, updating key risk indicators (KRIs), and evaluating the performance of incident response team members are also important activities during a post- incident review, but they are not as critical as evaluating the incident response effectiveness, which can provide a holistic and strategic view of the incident response maturity and value.
References =
* ISACA, CISM Review Manual, 16th Edition, 2020, page 2411
* ISACA, CISM Review Questions, Answers & Explanations Database - 12 Month Subscription, 2020, question ID 2192 During post-incident reviews, the highest priority should be given to evaluating the effectiveness of the incident response effort. This includes assessing the accuracy of the response to the incident, the timeliness of the response, and the efficiency of the response. It is important to assess the effectiveness of the response in order to identify areas for improvement and ensure that future responses can be more effective. Documenting the actions taken in sufficient detail, updating key risk indicators (KRIs), and evaluating the performance of incident response team members are all important components of a post-incident review, but evaluating incident response effectiveness should be given the highest priority.

The priority for implementing security controls should be based on the results of BIAs, which identify the criticality and recovery requirements of business processes and the supporting information assets. BIAs help to align security controls with business needs and objectives, and to optimize the allocation of security resources. Alignment with industry benchmarks, possibility of reputational loss due to incidents, and availability of security budget are important factors, but they are not the most important consideration for determining the priority for implementing security controls. References = CISM Review Manual, 16th Edition, page 971; CISM Review Questions, Answers & Explanations Manual, 10th Edition, page 2672

= The most important reason to ensure information security is aligned with the organization's strategy is to optimize security risk management. Information security is not an isolated function, but rather an integral part of the organization's overall objectives, processes, and governance. By aligning information security with the organization's strategy, the information security manager can ensure that security risks are identified, assessed, treated, and monitored in a consistent, effective, and efficient manner1. Alignment also enables the information security manager to communicate the value and benefits of information security to senior management and other stakeholders, and to justify the allocation of resources and investments for security initiatives2. Alignment also helps to establish clear roles and responsibilities for information security across the organization, and to foster a culture of security awareness and accountability3. Therefore, alignment is essential for optimizing security risk management, which is the process of balancing the protection of information assets with the business objectives and risk appetite of the organization4. References = 1: CISM Exam Content Outline | CISM Certification | ISACA 2: CISM_Review_Manual Pages 1-30 - Flip PDF Download | FlipHTML5 3: CISM 2020: Information Security & Business Process Alignment 4: CISM Review Manual 15th Edition, Chapter 2, Section 2.1