ITPEC FE Morning April 2020 Question 55
ITPEC FE Morning April 2020 — Question 55 of 80
Maintainability measures how quickly a service can be restored after failure. Its KPI is MTRS (Mean Time to Restore Service). A reduction in MTRS means faster recovery — improved maintainability.
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MTRS— average time to restore service after failure → measures maintainability - •
MTBF— average time between failures → measures reliability - •
MTBSI— average time between service incidents → measures reliability
Why not others:
- (a) MTBF — reliability KPI; higher is better, not a "reduction" target for maintainability
- (b) MTBSI — reliability KPI; tracks incident frequency, not repair speed
- (d) Number of interruptions — a count metric, not a time-based maintainability index
Key rule: Maintainability = speed of repair → MTRS. Lower MTRS = better maintainability.
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