OEE — Overall Equipment Effectiveness

OEE measures how much of a machine's planned production time was truly productive: Availability × Performance × Quality.

Availability = run time ÷ planned time. Performance = actual output ÷ (rated output × run time). Quality = good units ÷ total units. Multiply the three; world-class is ~85%, a typical unmeasured plant sits at 40–60%.

Example: planned 8h, ran 7h (A = 87.5%), produced 250 of a possible 280 (P = 89.3%), 242 good of 250 (Q = 96.8%) → OEE = 75.6%.

The value is in the decomposition: a low OEE from Availability points at maintenance; from Performance at speed losses; from Quality at process. One daily production line per machine is enough data to compute it.