CRISC · Question #352
Which of the following is the BEST key performance indicator (KPI) to measure the ability to deliver uninterrupted IT services?
The correct answer is A. Mean time between failures (MTBF). To measure the ability to deliver uninterrupted IT services, the best KPI indicates how long services typically operate without an incident or failure.
Question
Which of the following is the BEST key performance indicator (KPI) to measure the ability to deliver uninterrupted IT services?
Options
- AMean time between failures (MTBF)
- BMean time to recover (MTTR)
- CPlanned downtime
- DUnplanned downtime
How the community answered
(42 responses)- A76% (32)
- B7% (3)
- C14% (6)
- D2% (1)
Why each option
To measure the ability to deliver uninterrupted IT services, the best KPI indicates how long services typically operate without an incident or failure.
Mean time between failures (MTBF) measures the average time elapsed between inherent failures of a system, serving as a direct indicator of system reliability and, consequently, its ability to provide uninterrupted service.
Mean time to recover (MTTR) measures how quickly a system can be restored after a failure, indicating efficiency of recovery, not the prevention of interruption.
Planned downtime refers to scheduled service interruptions for maintenance, which is not a measure of uninterrupted service capability.
Unplanned downtime measures the total time services are unavailable due to unexpected failures, but MTBF provides a more proactive and predictive measure of reliability.
Concept tested: IT service continuity KPIs
Source: https://learn.microsoft.com/en-us/azure/architecture/resiliency/reliability-patterns#mean-time-to-recovery-mttr-and-mean-time-between-failures-mtbf
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