A CMMS (computerized maintenance management system) is software that schedules, tracks, and records maintenance work and asset service history.
A CMMS (computerized maintenance management system) is software that schedules, tracks, and records maintenance work - the work orders, preventive maintenance calendars, spare parts, and per-asset service history of a maintenance operation. The category grew out of replacing paper job cards and wall planners, and its centre of gravity has never moved: the work order is the core object, and everything else exists to feed, schedule, or report on it.
What a CMMS does
The recurring capabilities across the category:
- Work orders - a job record per task: the asset, the fault or planned work, who it is assigned to, priority, status, and what was done.
- Preventive maintenance scheduling - recurring work generated automatically by calendar or usage, so equipment servicing happens on plan rather than on failure.
- Asset and service history - every job logged against the asset it touched, building the record that reveals repeat offenders.
- Spare parts and inventory - which parts exist, where, and how many, so jobs do not stall waiting; see spare parts management.
- Reporting - backlog size, completion rates, downtime by asset, cost per asset.
The underlying purpose is shifting the mix from reactive to planned work - the trade-off described under planned vs unplanned maintenance - because scheduled work is cheaper and less disruptive than the same work forced by a breakdown.
CMMS vs asset management software
The two categories overlap and are regularly confused. A CMMS is organised around the work: its natural questions are “what jobs are due this week?” and “which technician is on it?”. Asset management software is organised around the assets: “what do we own, who has it, where is it, what has happened to it, what is it worth?”. Repairs appear in both, but with different framing - a CMMS treats a repair as a work order to schedule and cost; an asset management system treats it as an event in the asset’s history, alongside checkouts, transfers, and ownership changes. A factory with three maintenance technicians needs the first; an office or field team trying to keep track of laptops, tools, and signage usually needs the second.
CMMS vs EAM
EAM (enterprise asset management) is the heavyweight sibling: it wraps a CMMS core in financial planning, procurement, capital project management, and lifecycle costing across an entire estate. The boundary is blurry and partly marketing, but the rule of thumb holds - CMMS manages the maintenance department’s work; EAM manages the asset base as a financial concern across its whole life.
Who actually needs a CMMS
A CMMS earns its keep where maintenance is a discipline in its own right: dedicated technicians, machinery with manufacturer service regimes, regulatory inspection obligations, parts stock worth managing. The honest signal is volume and recurrence of planned work. Teams whose pain is “we do not know what we own, who has it, or what has been fixed” have an asset-visibility problem rather than a maintenance-scheduling problem, and a CMMS will not solve it. In practice, a team like that needs an asset register first - AMPthilly takes this route, pairing the register with a built-in service desk where faults are reported with photos, tracked through a status queue, and kept permanently on the asset’s history.
Related terms
- Planned vs Unplanned Maintenance - the balance a CMMS exists to shift
- Equipment Servicing - the recurring work a CMMS schedules
- Spare Parts Management - keeping parts available so work orders do not stall
- Asset Uptime - the availability measure maintenance software is judged on
- Service Level Agreement - the response commitments some maintenance teams work to