CMMS and Maintenance Management: The Complete Guide

What Is a CMMS?

A CMMS, or computerized maintenance management system, is software that centralizes the information a maintenance team needs to do its job: what assets exist, what work needs doing, when it's due, and what already happened. Instead of that information living in someone's memory, a shared chat thread, or a paper log, it lives in one place everyone can see.

At its core, a CMMS tracks four things: an asset list (what equipment or facilities you maintain), work orders (tasks that need doing, assigned and tracked to completion), a preventive maintenance schedule (recurring tasks triggered by time or usage), and a history (what was done, by whom, and when). Everything else, from parts inventory to downtime reporting, builds on top of those four.

When Do You Need a CMMS?

Not every team needs one immediately. A shared checklist can genuinely work fine for a small, stable set of equipment. The signs that a team has outgrown it tend to show up as recurring friction rather than a single clear moment:

• The same failure keeps getting re-diagnosed. A technician solves a problem, doesn't write down what fixed it, and someone else solves the same problem from scratch months later.
• Preventive tasks slip without anyone noticing until something breaks. There's no reminder mechanism, so "due this month" quietly becomes "overdue by three months."
• Nobody can answer "what have we done to this asset" without asking around. History lives in people's memory instead of a record.
• Inspections need to be provable, not just done. Insurance, a customer audit, or a regulator wants documentation, and "we definitely did that" isn't documentation.
• More than one or two people touch maintenance work. Once a second or third person is involved, an informal system depends on everyone independently remembering the same things, which tends to be where it breaks down.

One or two of these showing up occasionally is normal. Several showing up regularly is usually the point where a defined system, whether that's dedicated CMMS software or a structured spreadsheet, starts saving more time than it costs to set up.

Preventive vs. Corrective Maintenance

Preventive maintenance is scheduled before a failure happens: recurring tasks (inspect, lubricate, replace, calibrate) triggered on a set interval, meant to catch wear before it causes a breakdown. Corrective maintenance is the work logged after something has already failed.

Neither one replaces the other. A functioning maintenance program runs both: preventive tasks to reduce how often things break, and a clear way to log and track corrective work when they do anyway. Teams that only do corrective maintenance tend to spend most of their time firefighting; the point of adding preventive tasks isn't to eliminate breakdowns entirely, but to shift the ratio so fewer of them are urgent and unplanned.

How Preventive Maintenance Scheduling Works

Preventive tasks are usually triggered one of two ways:

• Time-based. The task repeats on a calendar interval: every 30 days, every quarter, every year.
• Usage-based. The task repeats based on how much the asset has been used: every 500 operating hours, every 10,000 km, every production cycle count.

Time-based scheduling is simpler to set up and is the right default for most small teams starting out. Usage-based scheduling is more accurate for equipment whose wear depends on how hard it's run rather than how much time has passed, but it requires actually tracking usage, which is more overhead than most small teams take on until they have a specific asset that needs it.

CMMS vs. EAM: What's the Difference?

The terms get used loosely, but there's a real distinction. A CMMS focuses on maintenance operations: work orders, preventive schedules, and asset history. An EAM (enterprise asset management) system covers the full lifecycle of an asset, including procurement, depreciation, and capital planning, usually across a much larger, multi-site organization.

Small and mid-size businesses almost always need what a CMMS provides, not the added financial and lifecycle layers of a full EAM. If your team is asking "what did we do to this machine and when is the next task due," that's a CMMS question. If you're asking "should we replace this asset or extend its depreciation schedule across five facilities," that's an EAM question.

Spreadsheets, Dedicated CMMS Software, or Google Sheets

Small teams generally land on one of three approaches:

A shared spreadsheet or checklist. Works for a small, stable set of equipment and one or two people doing the maintenance. The limits appear as the asset list grows: no automatic reminders when a task is due, no enforced structure for logging what was actually done, and no easy way to see history per asset without scrolling through everything.

Dedicated CMMS software. Purpose-built systems handle recurring schedules, technician assignment, and reporting well. The tradeoff is a new tool for the team to adopt, usually with per-user pricing that can become the most expensive line in the stack once everyone who touches maintenance is counted, not just the lead technician.

A structured add-on inside Google Sheets. Keeps the day-to-day work inside the spreadsheet your team already opens, while adding the structure a plain checklist lacks: defined work orders, preventive schedules that actually trigger, and a real history per asset. This is the approach Fixeets Maintenance takes, for teams that would rather extend a tool they already trust than adopt a new one.

The same test that applies to inventory tooling applies here: teams with no existing spreadsheet habit sometimes do better starting directly with dedicated software. Teams already coordinating maintenance in Google Sheets, who just want that sheet to stop relying on someone remembering the schedule, are usually better served by adding structure to what they already use.

Maintenance KPIs Worth Tracking

• PM compliance rate: the percentage of scheduled preventive tasks completed on time (completed on schedule ÷ total scheduled, as a percentage). Below roughly 80% usually means the schedule is unrealistic for the team's capacity, not that the team is careless.
• Mean time to repair (MTTR): total repair time ÷ number of repairs, over a given period. This is how long a corrective task takes from report to resolution, on average.
• Mean time between failures (MTBF): total operating time ÷ number of failures. A falling MTBF flags equipment that needs closer attention or replacement.
• Unplanned downtime: time lost to failures that weren't scheduled, the clearest single number for showing whether preventive work is paying off.
• Backlog: open work orders that haven't been started. A growing backlog usually means demand has outpaced technician capacity, not that technicians are falling behind.

Tracking PM compliance and unplanned downtime from day one catches the most common problems. The rest become more useful once there's a few months of history to compare against, since a single MTTR or MTBF number means little without a trend to compare it to.

Common Maintenance Management Mistakes

• No documented history per asset. Without a record, every recurring issue gets re-diagnosed from scratch by whoever happens to handle it next.
• A preventive schedule nobody actually follows. A schedule that isn't realistic for available technician time quietly turns into a schedule that's ignored.
• Treating every asset the same. A backup generator that runs once a year needs different attention than a production line that runs daily; equal scrutiny for both wastes effort on the low-risk one.
• No compliance trail for regulated equipment. If inspections are legally required, an undocumented one is functionally the same as one that never happened.
• Corrective work with no root cause tracking. Logging that something broke without logging why makes the same failure likely to repeat.

How to Choose a CMMS

1. Does it match how your team already works? A system technicians avoid opening loses to the whiteboard it was supposed to replace.
2. Can it handle both time-based and usage-based scheduling, if you need both? Not every team does, but check before committing.
3. Does it give you a real history per asset, not just a current status? You need to be able to answer "what have we done to this machine," not just "is it currently fine."
4. Is mobile access good enough for technicians in the field, not just office staff? A CMMS only office staff can use gets half-adopted.
5. What does it cost per user, and does that scale the way your team will? Per-seat pricing that's fine for three technicians can become the most expensive part of the stack once every technician who touches a work order is counted.

Managing Maintenance in Google Sheets

Teams already running on Google Workspace have a real reason to keep maintenance there too: no new login for technicians to remember, no separate export to reconcile with other operational data, and a format the whole team can already read.

What a plain spreadsheet is missing is structure: work orders that are actually assigned and tracked, preventive schedules that trigger reliably instead of depending on someone checking a tab, and a real history per asset. Fixeets Maintenance adds that structure directly inside Google Sheets, so a team moving from an unreliable checklist to a real system doesn't have to leave the tool they already use to do it.

FAQ

What is a CMMS?

A CMMS, or computerized maintenance management system, centralizes work orders, preventive maintenance schedules, and asset history in one place, so maintenance work doesn't depend on memory or scattered notes.

What's the difference between a CMMS and an EAM?

A CMMS focuses on day-to-day maintenance operations: work orders, schedules, and asset history. An EAM covers the full asset lifecycle, including procurement and capital planning, and is typically built for larger, multi-site organizations. Most small and mid-size businesses need a CMMS, not a full EAM.

Is a spreadsheet good enough for maintenance management?

For a small, stable set of equipment with one or two people handling maintenance, often yes. Once preventive tasks start slipping unnoticed, history stops being traceable, or inspections need to be provable rather than just done, most teams need either strict manual discipline or added structure, like a Google Sheets add-on, to keep the schedule reliable.

How much does a CMMS cost?

Dedicated CMMS software typically runs $20 to $50 per user per month, and per-user pricing can add up quickly once every technician is counted, not just the maintenance lead. Costs vary by feature set and by whether implementation or training is billed separately.