Overall Equipment Effectiveness, or OEE, is one number that tells you how much of a machine's planned time actually produced good product at full speed. It combines three measures. The first is whether the line was running when it should have been running. The second is whether, while it ran, it ran at its rated speed. The third is how much of everything it made was good the first time.
Each question becomes a factor between 0 and 1. Availability covers stops. Performance covers slow running and tiny stops. Quality covers rejects. Multiply the three and you get OEE. A line that is stopped a quarter of the time, runs a bit slow and throws away a few bottles can easily sit near 60 percent even though every single factor looks respectable on its own.
OEE is a diagnostic tool, not a scoreboard to beat people with. Its value is that it separates the losses into three buckets so you know where to look. A line at 77 percent with an availability problem needs a different fix than a line at 77 percent with a quality problem.
Standard Procedure
- 1Fix the time window: one shift, one line, from planned start to planned end.
- 2Record the three raw figures: minutes actually running, total bottles produced, good bottles.
- 3Convert each into its factor (Availability, Performance, Quality).
- 4Multiply the three factors and express the result as a percentage.
- 5Write the three factors next to the OEE value so the loss type stays visible.
Lesson Summary
- ✓OEE compresses stops, slow running and rejects into one number, but the three factors carry the real information.
- ✓Always report the factors with the OEE value; the number alone does not tell you what to fix.