From TPM for Supervisors by Kunio Shirose:

OEE Improvement Process

1. Measure the extent of each of the six big losses
2. Determine how much each loss affects OEE
3. Find out what problems stand in the way of improving availability, performance rate, and quality rate
4. Determine targets and orientations needed to solve problems discovered in step 3
5. Find out how higher equipment effectiveness will affect cost-cutting and profit-boosting

The Six Big Losses

1. Breakdown losses
2. Setup and adjustment losses
3. Idling and minor stoppage losses
4. Speed losses
5. Quality defects and rework
6. Startup/yield losses

Related posts:

1. Overall Equipment Effectiveness (OEE) and Other Operations Metrics
2. The Five Pillars of TPM