The Maintenance Maturity Index: five pillars, four levels
A self-scoring model built on recognised asset-management standards rather than on any vendor's feature list. Twenty questions, one honest answer per row.
- Structured on the five pillars of the recognised maintenance and reliability body of knowledge. [1]
- Anchored to the international asset-management standard rather than to software capability. [2]
- Four levels per pillar: Reactive, Recorded, Managed, Optimised.
- Scoring is deliberately unflattering — most operations score Recorded on at least one pillar.
Maturity models are usually published by suppliers, and usually conclude that maturity looks like buying more software. This one is built from two independent sources: an international standard and a professional society's body of knowledge, neither of which sells a maintenance system.
Where the structure comes from
The five assessment pillars follow the structure of the maintenance and reliability body of knowledge maintained by an independent professional society: business and management, manufacturing process reliability, equipment reliability, organisation and leadership, and work management. [1] The society is a non-profit practitioner body and administers an accredited certification in the field; it also publishes standardised metric definitions intended to make comparison between organisations meaningful. [3]
The levels are anchored to the international asset-management standard, which frames asset management around lifecycle thinking, performance measurement and a documented maintenance programme. [2] Where the standard requires something to be documented, an organisation that does it informally scores lower, however competent it is in practice.
The four levels
Level 1 — Reactive
Work happens when something fails. Records exist as invoices and memory. Nobody can state what an asset has cost or when it was last examined without an investigation.
Level 2 — Recorded
Work is captured consistently against assets after the fact. History exists and can be read. Planning is still largely reactive, and cost is attached late or approximately.
Level 3 — Managed
Work is planned, scheduled and approved through defined rules. Costs attach at entry. Statutory examinations sit in the schedule. Reports are produced routinely rather than on request.
Level 4 — Optimised
Intervals derive from evidence — meters, condition data, failure history — rather than from convention. Findings change the schedule. Performance is compared against standardised metric definitions rather than against last year.
Scoring the five pillars
| Pillar | What Level 2 looks like | What Level 4 looks like |
|---|---|---|
| Business and management | Maintenance spend is known in total | Cost per asset drives repair-versus-replace decisions |
| Process reliability | Downtime is noticed | Downtime is attributed to cause and trended by asset |
| Equipment reliability | Assets are registered with references | Intervals set from meters and condition data |
| Organisation and leadership | Roles exist informally | Authority, thresholds and deputies are defined and audited |
| Work management | Work orders are closed | Approval, execution and cost are one traceable record |
Score each pillar independently on the four levels, then take the lowest rather than the average. Maintenance maturity behaves like a chain: an operation running condition monitoring on assets whose register is unreliable is not Level 4 in any useful sense.
How to use the result
The value of the exercise is the disagreement it produces. Run it separately with the maintenance manager, a technician and someone from finance, then compare. Where the three answers differ by two levels, you have found something more useful than a score.
- Move the lowest pillar first, always. It is capping the others.
- Re-score annually, not quarterly — maturity moves slowly and frequent scoring invites optimism.
- Record the evidence for each score. A level claimed without evidence is a level aspired to.
An honest limitation
This index is a structured conversation, not a measurement instrument. The standardised metric definitions that would let you compare your score against other organisations are published as licensed material by the professional society, and reproducing their formulas here would be improper. [3] Organisations that want comparable numbers should license the metrics directly and apply them; this index will tell you where to look first.
References
- Society for Maintenance and Reliability Professionals, Guide to the Maintenance and Reliability Body of Knowledge — five pillars. smrp.org
- ISO 55000:2024, Asset management — vocabulary, overview and principles. iso.org
- Society for Maintenance and Reliability Professionals, Best Practices, Metrics and Guidelines. smrp.org
Related reading
The most useful numbers are the ones you record yourself
These reports draw on the best public data available. A live demo shows how SaharaDesk builds the same evidence — cost per asset, downtime by cause, compliance on record — from your own operation.