A Computerized Maintenance Management System (CMMS) is software that helps an organisation plan, schedule, record and analyse maintenance work. A CMMS stores asset information, work orders, maintenance plans, spare-parts data, failures, costs and work history.
In manufacturing, a CMMS helps maintenance teams move from reactive responses towards planned work. It can connect maintenance decisions with equipment condition, production schedules and the operational impact of downtime.
What does a CMMS manage?
- Assets: identity, location, hierarchy, technical information and maintenance history.
- Work orders: requests, priorities, assignments, instructions, labour, materials and completion notes.
- Preventive maintenance: recurring inspections, servicing and replacement tasks based on time, usage or condition.
- Spare parts: stock levels, reservations, suppliers and materials used during work.
- Failure data: symptoms, causes, corrective actions and downtime associated with an asset.
- Reports: workload, response time, repeat failures, cost and reliability indicators.
How does a CMMS work?
A maintenance request is captured and assessed, then converted into a work order if action is required. The work order can include the asset, priority, safety requirements, instructions, spare parts and responsible person. After completion, the team records what it found and did. The history supports future planning and failure investigation.
Preventive, predictive and reactive maintenance
Reactive maintenance restores equipment after a failure. Preventive maintenance schedules work before an expected failure, often using time or usage intervals. Predictive maintenance uses condition or process data to identify signs of deterioration. A CMMS can manage all three modes, but predictive work also requires trustworthy condition data and an analysis method.
CMMS versus EAM and MES
CMMS focuses on maintenance management. Enterprise Asset Management covers a broader asset lifecycle, including planning, procurement, operation, risk and disposal. MES focuses on production execution and shop-floor records. Machine or MES data can provide downtime context, while the CMMS manages the maintenance response and history.
Maintenance KPIs
- planned versus unplanned maintenance;
- work-order completion and schedule compliance;
- mean time to repair and mean time between failures;
- maintenance backlog and response time;
- spare-parts availability and cost; and
- repeat failures by asset, cause or location.
Benefits and limitations of a CMMS
A CMMS can improve maintenance visibility, reduce lost information, support planned work and make asset history easier to use. It cannot improve reliability if work orders remain incomplete, preventive plans lack analysis or technicians do not use the system at the point of work.
When should a manufacturer consider CMMS software?
CMMS software is worth evaluating when requests are managed through email or spreadsheets, asset history is hard to find, preventive work is missed or downtime causes are not connected to completed work. Start by cleaning the asset structure and defining the minimum information required to close a work order.
For a commercial overview of maintenance planning and asset-history workflows, see Accevo CMMS software for manufacturing.