Overall equipment efficiency (OEE) measures the ratio of how much of a product or part is being made defect-free versus how much could be made according to the equipment’s design. A machine or process that has an OEE of 100 percent is producing at its maximum designed capacity with zero defects. Three metrics – availability, performance and quality – make up OEE. When real output is lower than expected, practitioners can find opportunities for improvement in all three of these factors and take actions that maximize the current process capabilities, fix problems and improve productivity.