Measure the work system, not just the machine.
Maintenance performance is created by the handoff between demand, planning, materials, access, labor capacity, and production. OEE and backlog have different roles: one exposes production loss; the other makes work demand visible against available capacity.
OEE Calculator
Break a run into availability, performance, and quality factors.
Planning windowMaintenance Backlog
Express approved, ready work in crew-weeks.
Interpret the operating boundary first.
OEE is only comparable when planned production time, downtime rules, ideal cycle time, and quality disposition are consistently defined. Backlog is useful only when the hours represent scoped, estimated, approved work that can become schedulable.
Neither metric is a target in isolation. Use a trend and a category breakdown to decide whether the next action lies in reliability, planning, materials, skills, or production process control.