# MTBF & MTTR

KPIs, measured in seconds, which indicate, respectively, the reliability and maintainability of a plant or machinery.

## MTBF (Mean Time Between Failure)

The average time between the occurrence of one failure and the start of the next. The higher it is, the more reliable the machinery is.

## MTTR (Mean Time To Repair)

The efficiency of maintenance service. The lower it is, the more responsive maintenance is in solving problems.

<figure><img src="https://content.gitbook.com/content/pCDT7ZJMfw2DQ9011gYH/blobs/USVaMyoSnMqyatAgbcIp/mttf-mttr-mtbf.png" alt=""><figcaption></figcaption></figure>
