The answer is determining root cause, documenting lessons learned, and updating the incident response plan. These three components form the backbone of an effective post-incident review because they transform a reactive event into a proactive improvement cycle. Root cause analysis identifies the underlying failure, lessons learned capture what worked and what did not, and updating the plan ensures the organization does not repeat the same mistakes. On the Certified Information Security Manager CISM exam, this concept tests your understanding of the “Improve” phase of incident management, often appearing in scenario-based questions where distractors include “assigning blame” or “restoring systems immediately.” A common trap is confusing post-incident review with the containment phase—remember, review is about learning, not fixing. Memory tip: think “R-L-U” for Root cause, Lessons learned, Update plan—like a “rule” for continuous improvement.
CISM Incident Management Practice Question
This CISM practice question tests your understanding of incident management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE are key components of an effective post-incident review?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Document lessons learned
Determining root cause, documenting lessons learned, and updating the incident response plan are essential.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Document lessons learned
Why this is correct
Correct: Capturing what worked and what didn't drives future improvements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase security budget
Why it's wrong here
Budget increase may be a recommendation but is not a component of the review itself.
✗
Assign blame
Why it's wrong here
Blame assignment destroys trust and hinders improvement.
✓
Update incident response plan
Why this is correct
Correct: The plan should be revised based on findings.
Related concept
Read the scenario before looking for a memorised answer.
✓
Determine root cause
Why this is correct
Correct: Understanding why the incident occurred is fundamental.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CISM exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which CISM exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Incident Management — This question tests Incident Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Document lessons learned — Determining root cause, documenting lessons learned, and updating the incident response plan are essential.
What should I do if I get this CISM question wrong?
Identify which CISM exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are recommended practices when conducting a post-incident review? (Select TWO)
hard
✓ A.Document lessons learned and improvement actions
B.Update the incident response plan immediately
C.Assign blame to responsible individuals
✓ D.Identify the root cause of the incident
E.Reimage all affected systems
Why A: Correct: Identifying root cause (B) and documenting lessons learned (C) are key. Assigning blame (A) is discouraged. Updating the IRP (D) is a result, but not the review itself. Reimaging systems (E) is recovery, not review.
Variation 2. An organization's incident response team is conducting a lessons learned meeting after a major incident. Which outcome is MOST critical to document?
medium
✓ A.Root cause analysis
B.Detailed timeline of events
C.List of tools used
D.Total cost of the incident
Why A: Option B is correct because root cause analysis prevents recurrence. Option A is wrong although timeline is useful, root cause is more critical. Option C is wrong because cost is not the primary learning objective. Option D is wrong because tool list is less strategic.
Variation 3. During an incident, the incident response team determines that a compromised account was used to exfiltrate data. The account has been disabled. What is the NEXT best action to prevent similar incidents?
medium
A.Notify potentially affected customers
✓ B.Perform a root cause analysis
C.Reset passwords for all user accounts
D.Review authentication logs for other anomalies
Why B: Conducting a root cause analysis identifies how the account was compromised (e.g., phishing, weak password), allowing implementation of preventive measures like multifactor authentication. Resetting all passwords (A) is reactive. Notifying affected customers (C) is a legal step after investigation. Reviewing logs (D) is part of analysis but not the next best preventive action.
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This CISM practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISM exam.
Question Discussion
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