ITPEC FE Morning April 2019 Question 57
ITPEC FE Morning April 2019 — Question 57 of 80
Maintainability KPI — Mean Time to Restore Service (MTRS) measures how quickly a service is restored after failure.
In ITIL availability management, maintainability reflects how fast a system can be repaired. Its KPI is MTRS (Mean Time to Restore Service). A reduction in MTRS means faster recovery, which is a positive outcome — hence it is cited as a KPI improvement example.
The correct answer is c) Mean time to restore service.
Why not the others:
- a) Mean time between failures (MTBF) — measures reliability, not maintainability. A higher MTBF is better (longer uptime), so "reduction" would be negative.
- b) Mean time between service incidents — also relates to reliability/availability, not to repair speed.
- d) Number of interruptions in a certain period — counts failures but does not measure how quickly they are resolved.
Key rule: Maintainability = speed of repair → MTRS. Reliability = duration of uptime → MTBF. In ITIL, reducing MTRS is a maintainability improvement; increasing MTBF is a reliability improvement.
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