Quick Answer
The answer is Mean Time to Resolve (MTTR) incidents. This metric is the most appropriate for measuring incident management effectiveness because it directly captures the elapsed time from when an incident is logged until normal service operation is restored, reflecting both process efficiency and team responsiveness within an ITIL-based ITSM tool. On the Certified Information Systems Auditor (CISA) exam, this question tests your understanding of operational metrics that align with IT governance and service management objectives, often appearing in scenarios where you must distinguish MTTR from metrics like Mean Time Between Failures (MTBF) or Mean Time to Detect (MTTD). A common trap is confusing MTTR with a measure of prevention or detection; remember that MTTR specifically gauges resolution speed, not failure frequency. For a quick memory tip, think “Resolve equals Response” — MTTR tells you how fast the team gets the service back up and running.
This CISA practice question tests your understanding of governance and management of it. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
An organization has implemented a new IT service management (ITSM) tool. The IT manager wants to measure the effectiveness of incident management. Which metric is MOST appropriate?
Mean time to resolve (MTTR) incidents
MTTR directly measures how quickly incidents are resolved.
Percentage of incidents resolved on first call
Why wrong: First call resolution is a quality metric but not the primary effectiveness measure.
Number of incidents reported per month
Why wrong: Volume does not indicate effectiveness.
Percentage of system uptime
Why wrong: Uptime measures availability, not incident management effectiveness.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Mean time to resolve (MTTR) incidents
Mean time to resolve (MTTR) is the most appropriate metric for measuring the effectiveness of incident management because it directly reflects how quickly the IT team can restore normal service operation after an incident. In ITIL-based ITSM tools, MTTR tracks the elapsed time from incident logging to resolution, providing a clear indicator of process efficiency and team responsiveness.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Mean time to resolve (MTTR) incidents
Why this is correct
MTTR directly measures how quickly incidents are resolved.
Related concept
Read the scenario before looking for a memorised answer.
Percentage of incidents resolved on first call
Why it's wrong here
First call resolution is a quality metric but not the primary effectiveness measure.
Number of incidents reported per month
Why it's wrong here
Volume does not indicate effectiveness.
Percentage of system uptime
Why it's wrong here
Uptime measures availability, not incident management effectiveness.
Common exam traps
The trap here is that candidates often confuse incident management metrics with service desk or availability metrics, picking 'percentage of incidents resolved on first call' because it sounds like a measure of effectiveness, but it actually measures first-contact resolution efficiency, not the end-to-end incident management process.
Detailed technical explanation
In ITSM tools like ServiceNow or Jira Service Management, MTTR is calculated by averaging the difference between the 'Resolved' timestamp and the 'Created' timestamp for all closed incidents. A subtle behavior is that MTTR can be skewed by a few long-running incidents, so organizations often also track median time to resolve or use percentile distributions (e.g., P95) to get a more accurate picture. In real-world scenarios, a low MTTR combined with a high number of recurring incidents may indicate that root cause analysis is being skipped, masking underlying problems.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CISA 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
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FAQ
Governance and Management of IT — This question tests Governance and Management of IT — Read the scenario before looking for a memorised answer..
The correct answer is: Mean time to resolve (MTTR) incidents — Mean time to resolve (MTTR) is the most appropriate metric for measuring the effectiveness of incident management because it directly reflects how quickly the IT team can restore normal service operation after an incident. In ITIL-based ITSM tools, MTTR tracks the elapsed time from incident logging to resolution, providing a clear indicator of process efficiency and team responsiveness.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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