CMMS (Computerized Maintenance Management System)
Software that tracks equipment, work orders, and scheduled maintenance in one place.
Quick Answer
A CMMS, or computerized maintenance management system, is software that centralizes a facility's asset records, work orders, maintenance schedules, parts inventory, and service history. It lets maintenance teams plan preventive work, respond to requests, and report on cost and downtime instead of relying on paper logs or memory.
The Full Picture
A CMMS replaces the clipboards, spreadsheets, and tribal knowledge that maintenance teams historically used. At its core it is a database of assets, such as boilers, air handlers, pumps, and elevators, linked to the work performed on them. Each asset has a record of its location, specifications, warranty, and history, so technicians can see what was done before and what is due next.
The central object in most systems is the work order. A request comes in from an occupant or from a scheduled task, a work order is created and assigned, the technician records labor and parts, and the order is closed with notes. Over time this builds a record that supports decisions about repair versus replace, staffing, and vendor performance.
Common CMMS capabilities include preventive maintenance scheduling, inventory and spare-parts tracking, mobile access for technicians, vendor and contract records, and reporting dashboards. Some systems accept data from building sensors, which is where a CMMS begins to overlap with condition-based and predictive approaches. A CMMS differs from an IWMS, which usually adds real estate, lease, space, and project modules on top of maintenance.
A CMMS is only as good as the data loaded into it. Standing up a system typically means building an asset register from the handover documents, equipment schedules, and manuals delivered at the end of construction. Owners who ask contractors for structured equipment data at turnover shorten that setup considerably.
Real Examples
Common Misconceptions
People assume: A CMMS is the same thing as an IWMS.
Actually: A CMMS focuses on maintenance and assets. An IWMS is broader and typically adds space, lease, project, and real estate management modules.
People assume: Installing a CMMS automatically improves maintenance.
Actually: The software only records and schedules what the team enters. Value depends on accurate asset data, consistent work-order discipline, and well-designed maintenance routines.
Frequently Asked Questions
What does CMMS stand for?
CMMS stands for computerized maintenance management system. It is software used to manage maintenance activities, assets, and work orders.
What is the difference between a CMMS and an EAM?
An enterprise asset management (EAM) system generally covers the full lifecycle of assets across an organization, including procurement, financials, and disposal, while a CMMS concentrates on maintenance operations. In practice the terms overlap and vendors use them differently.
What data does a CMMS need to get started?
Typically an asset register with equipment names, locations, models, and serial numbers, plus maintenance procedures and schedules. Handover documents such as O&M manuals and equipment schedules are a common source.
Can a CMMS support predictive maintenance?
Some systems can ingest sensor or meter data and trigger work orders based on condition thresholds. Predictive analytics usually requires additional monitoring tools and enough historical data to be useful.