Cmms vs eam is a question of scope. A CMMS holds the maintenance life of an asset: register, schedule, work orders, history. An EAM, enterprise asset management, holds the whole life: purchase, commissioning, depreciation, procurement, disposal, and the maintenance in between. The difference between cmms and eam is therefore not features so much as who else in the business needs the record. This page sets out what each holds, where cmms and eam overlap, and why the eam vs cmms decision is usually made by finance rather than by the maintenance manager who will use it.
What a CMMS holds
Assets and where they are. The preventive schedule against each. Every work order, planned and reactive, with its findings and its time. The history that produces MTBF, MTTR and cost by asset. Some inventory of spares, in most products. That is the maintenance manager's whole world, and for most small and mid-sized operations it is the whole requirement.
What an EAM adds
The financial asset: purchase cost, depreciation, book value, the capital project that bought it, the purchase orders for its parts, the contracts with the vendors who service it, and the disposal at the end. Procurement and stores are first-class modules rather than a spares list. Reporting rolls maintenance cost into the asset's total cost of ownership. The maintenance screens inside an EAM are often a CMMS by another name, sometimes a less convenient one.
Where they overlap and where they part
Both hold the register, the schedule and the work order. Both report on maintenance cost. They part on who owns the asset record: in a CMMS it is maintenance, in an EAM it is finance, and the maintenance team lives inside a system built for the ledger. That is why an EAM setup is a project with an integrator and a CMMS setup is a fortnight with a spreadsheet export.
Deciding, and who decides
If finance needs maintenance cost against the depreciated asset in the same system, and procurement needs to raise purchase orders from work orders, the operation needs an EAM and finance will say so. If the need is a schedule that runs, work orders that close, and a history that is readable, the operation needs a CMMS, and it should resist being given an EAM because the finance system has a maintenance module. The worked example on this site, 180 assets and 240 work orders a month, is a CMMS-sized operation.
Questions people ask about cmms vs eam
Is an EAM just a bigger CMMS?
Functionally it contains one. Organisationally it is a different system with a different owner, and that is the difference that shows up in daily use.
Can a CMMS grow into an EAM?
Some vendors sell both and the upgrade path exists. Most operations that start on a CMMS never need to take it.
Which is cheaper?
A CMMS, almost always, in licence and in setup. An EAM is priced for the enterprise it is named after.
Does an EAM do maintenance scheduling better?
Rarely. The schedule and the mobile work order are where CMMS products have concentrated, and an EAM's maintenance module can be the older, heavier part of the product.