Written for people who run machines, not for people who sell software.

Short, practical and free of hype. What the numbers mean, how to get them, and what to do with them on a Tuesday afternoon.

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Glossary

Twelve terms, defined the way they are measured in Concept Digital Factory.

OEE01: Overall Equipment Effectiveness. Availability × Performance × Quality, expressed as a percentage of planned production time.
Availability02: Run time divided by planned production time. Loses points to every stop, planned or not, inside the planned window.
Performance03: Ideal cycle time divided by actual cycle time while running. Loses points to slow cycles and micro-stops.
Quality04: Good parts divided by total parts produced. Loses points to scrap and rework.
Takt time05: The rate at which parts must be completed to meet customer demand. Cycle time must sit inside it.
Cycle time06: Time from the start of one part to the start of the next on a machine, measured, not assumed.
Micro-stop07: A stop shorter than a set threshold, usually two minutes, that rarely gets reported manually.
MTBF08: Mean Time Between Failures. Average running time between unplanned stops.
MTTR09: Mean Time To Repair. Average duration of an unplanned stop from start to restart.
Changeover10: Time from the last good part of one order to the first good part of the next.
Digital twin11: A live data counterpart of a physical machine: its state, history and plan, kept in sync with the floor.
Reason code12: A short, agreed label an operator or the system attaches to a stop so losses can be ranked by cause.

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