After several critical time intervals are found to have OEE down, root cause analysis is then utilized to identify possible performance detractors: crucial machine statuses.

• 根据OEE及其变异之不同组合情况，可将机台群组划分为四个大类，并说明各类型之机台群组之特性及优劣，进而列举可能造成群组类型变化之原因。