Overall equipment effectiveness (OEE) is a hierarchy of metrics developed by Seiichi Nakajima in the 1960s to evaluate how effectively a  manufacturing  operation is utilized. It is based on the Harrington Emerson  way of thinking regarding labor efficiency. The results are stated in a generic form which allows comparison between manufacturing units in differing industries. It is best used to identify scope for process performance improvement, and how to get the improvement. If for example the cycle time  is reduced, the OEE will increase i.e. more product is produced for less resource. Another example is if one enterprise serves a high volume, low variety market, and another enterprise serves a low volume, high variety market. More changeovers  (set-ups) will lower the OEE in comparison, but if the product is sold at a premium, there could be more margin with a lower OEE.

To know more about OEE
http://en.wikipedia.org/wiki/Overall_equipment_effectiveness

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