MTTR is more important than MTBF (for most types of F)

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UPDATE, 10/17/2017: This post hasn’t aged well, and needs some patching. The title should be “TTR is more important than TBF (for most types of F)” Why? Because taking the statistical mean of TTR or TBF makes absolutely no sense, whatsoever. Incidents and events simply are not comparable in that way, and even if they were, the time […]