Mean Time To Detect (MTTD)

Definition

MTTD would be the difference between the onset of any event that is deemed revenue impacting and its actual detection by the technician who then initiates some specific action to recover the event back to its original state. This would not be the same as starting the "Mean Time To Repair" (MTTR) clock. (i.e. once the technician receives a trouble ticket). The onset of any revenue impacting event almost always is recorded at some specific time by some specific equipment. The key element would be

Formula

Use Case / Interpretation

From this value a “detection skill ratio” could be calculated by dividing the MTTR by MTTD Detection Skill = Mean Time to Repair / Mean Time to Discovery Or DS = MTTR/MTTD

Tags

repair, revenue, maintenance

Metadata

Category: ITIL Incident management · Added: May 17, 2026