Measure of Equipment Effectiveness Often Misused
By Robert M. Williamson, president of Strategic Work Systems
Overall equipment effectiveness (O.E.E.) has been used as one of the more important "maintenance metrics" since Total Productive Maintenance (TPM) came to the U.S. in the late 1980s. O.E.E. is the primary measure used in TPM to identify and quantify the major equipment-related losses and a metric for rating "equipment effectiveness." O.E.E. has become widely used in many plants with or without the elements of TPM in place since the early years of TPM to quantify equipment effectiveness losses. This usage has also caused some confusion and has led to many misuses of the O.E.E. percentage calculation.