Concise definitions for the maintenance terms that shape planning, scheduling, PM strategy, reliability analysis, CMMS data, and work-management decisions.
This glossary defines the core terms XRVE Reliability uses when analyzing maintenance work, failure history, PM strategy, backlog, and reliability priorities. Each definition is intentionally concise, and each term links to the longer guide that owns the topic. The definitions describe how XRVE uses the term in an industrial maintenance context; they are not substitutes for customer standards, regulatory definitions, or controlled technical procedures.
Maintenance planning is the preparation of work before execution. A planned job should define the scope, labor, materials, tools, safety requirements, access, technical information, and coordination needed so the technician can perform the work with less avoidable uncertainty.
Maintenance scheduling is the commitment of ready work to a time period using real labor capacity and asset access. Scheduling decides when prepared work should happen. It should not be used to hide weak planning or to load work that cannot actually be executed.
Ready backlog is approved maintenance work that can actually be scheduled and executed. The job has enough scope, labor, material, tooling, information, access, and coordination resolved that the scheduler can confidently use it to fill available capacity.
Backlog weeks estimate how many weeks of available planned-work capacity are represented by the executable backlog. The denominator should reflect the labor capacity realistically available to planned backlog work, not simply gross paid hours.
Maintenance schedule compliance measures whether work committed to the frozen schedule was actually completed as scheduled. The organization should define the schedule freeze, denominator, cancellation rules, and whether the measure uses work orders or labor hours before comparing results over time.
Break-in work is work added after the schedule is frozen that consumes capacity intended for previously committed work. Some break-ins are legitimate. Repeated break-ins should still be classified by cause because they can reveal late defect discovery, priority inflation, poor planning, access problems, or unstable operations.
PM compliance is an execution metric showing whether preventive maintenance work was completed inside the required timing rule. It tells you whether scheduled PM work happened. It does not by itself prove that the task controls failure or adds technical value.
PM effectiveness asks whether the preventive maintenance task meaningfully manages a credible failure mode. A useful PM should have a clear purpose, executable task wording, an appropriate task type and interval, observable acceptance criteria, and a path from abnormal findings to corrective action.
PM frequency optimization is the disciplined review of how often a maintenance task should be performed. The interval should be supported by failure behavior, task type, condition findings, site experience, operating context, regulatory requirements, OEM authority, or other defensible evidence rather than arbitrary percentage changes.
Failure-mode-based maintenance selects the maintenance response according to how the required function can fail. Depending on the failure behavior, the appropriate strategy may be time-directed PM, condition monitoring, failure-finding, redesign, operating controls, or deliberate run-to-failure.
A maintenance bad actor is an asset or recurring failure pattern consuming disproportionate maintenance capacity or business attention. Useful bad-actor analysis considers more than failure count and can include reactive labor, downtime, repeat work, emergency events, cost, consequence, and record quality.
Asset criticality ranks the consequence of losing an asset's required function. A practical criticality matrix can consider safety, production, quality, environmental impact, recovery cost, redundancy, and resilience. Criticality should influence maintenance policy, but it should not automatically determine the urgency of every job on that asset.
Maintenance priority is the urgency assigned to a specific job based on the current defect, consequence, and time available before the risk becomes unacceptable. Asset criticality is useful context, but priority is a work decision rather than a permanent property of the asset.
A repeat failure is a recurring, comparable failure pattern after previous corrective work. Similar wording in work orders is not enough. The events should be validated at the asset, component, function, symptom, or failure-mode level before recurrence is treated as evidence for structured RCA.
CMMS data quality is the degree to which maintenance records are complete, consistent, correctly associated, and specific enough to support trustworthy analysis. Asset hierarchy, work type, priority, dates, labor, failure coding, PM history, backlog state, and closeout quality all affect analytical confidence.
Work order closeout is the record of what maintenance found, changed, verified, and learned when work was completed. Good closeout captures the symptom, finding or cause where known, correction, verification, labor, parts, and follow-up so completed work becomes usable reliability evidence.
XRVE Reliability uses consistent terminology so maintenance evidence can be analyzed and discussed clearly. Where a customer standard, engineering definition, OEM requirement, regulatory rule, safety procedure, or controlled site document defines a term differently, the approved authority remains controlling.