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It is generally accepted that we should figure out the items which have room for improvement to manage productivity. However, the items with low productivity do not always mean problem items when evaluating the productivity. That is the reason why we need the new evaluation indicator for managing the productivity. Firstly this study suggests ideal productivity, obtainable productivity and actual productivity. And secondly based upon those concepts, this paper proposes the new evaluation indicator, productivity achievement ratio(PAR). PAR is the ratio of actual productivity to obtainable productivity and we can find that as PAR goes to 1, the productivity management goes to the success. We should pay attention to low PAR items to implement successful management on productivity.