Overall Equipment Effectiveness (OEE) is a performance metric used to assess the efficiency of a manufacturing operation. Its computation involves determining the product of three factors: Availability, Performance, and Quality. Availability represents the proportion of scheduled time that the equipment is actually running. Performance reflects the speed at which the equipment is operating compared to its theoretical maximum speed. Quality measures the proportion of good parts produced relative to the total number of parts started. As an example, an OEE of 100% implies that the equipment is running only during scheduled production time, producing parts as fast as possible, and producing only good parts.
The quantification of manufacturing performance offers numerous advantages. It provides a standardized method for tracking progress, identifying areas for improvement, and benchmarking against industry standards or internal targets. A higher score typically translates to reduced waste, increased throughput, and improved profitability. Historically, this metric evolved from a need for a more comprehensive view of production efficiency than simple output measures could provide.