Overall Equipment Effectiveness is often reported as one percentage, but the accuracy of that number depends on clear definitions of planned production time, ideal cycle and good quantity.
Availability errors
Decide whether planned breaks and maintenance are excluded from planned production time. Do not change the definition between shifts just to improve the score; inconsistent boundaries make comparisons misleading.
Performance errors
Use an appropriate ideal cycle time for the actual product mix. An outdated standard or mixing products with very different cycles can distort performance and hide slow running.
Quality errors
Count good output consistently. Clarify whether start-up rejects, rework and inspection holds are included in total count. Counting reworked parts as new output can inflate results.
Look beyond the percentage
The familiar six major losses include breakdowns, setup and adjustments, minor stops, reduced speed, startup rejects and production rejects. A useful OEE review turns these losses into prioritized actions.
Conclusion
The purpose of OEE is finding and reducing losses, not producing a flattering score.
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