Maintenance Management Glossary

Plain-English definitions of the terms you'll encounter in maintenance management, CMMS evaluation, and reliability engineering.

Asset management in maintenance means maintaining accurate records of physical equipment — location, history, PM schedules, and li

CMMS (Computerized Maintenance Management System)

A CMMS (Computerized Maintenance Management System) is software that centralizes maintenance work orders, asset records, PM schedu

Deferred maintenance definition: maintenance work that has been identified and documented but intentionally postponed, usually due

MTBF (Mean Time Between Failures) is the average operating time between failure events for a repairable asset, calculated as Total

MTTR (Mean Time To Repair) is the average time required to repair a failed asset, calculated as Total Repair Time divided by Numbe

OEE definition: Overall Equipment Effectiveness measures how productively a piece of equipment is used, expressed as Availability

PM compliance definition: the percentage of scheduled preventive maintenance tasks completed on time, calculated as completed PMs

Preventive maintenance (PM) is scheduled maintenance performed on equipment at regular intervals to reduce the likelihood of failu

A work order in maintenance is a documented request to perform a specific maintenance task, containing the asset, location, descri

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