The conclusion that can be drawn from the new analysis is that internal process improvements had very positive effects on the overall performance. The efforts made to improve the manage- ment of sporadic demand parts had increased their performance most significantly. The majority of the stock-out costs are still found in the high volume materials although the company had made changes in the inventory control of these materials. However, without significantly increasing the safety-stocks for these materials, the service performance cannot be improved with internal management. Thus the effort should be made to reduce variances related to the supply link. This is consistent with the fact that the case company had concentrated the improvement efforts mostly on the internal process and supply link. The finding also confirms the hypothesis that for the total distribution chain improvements, narrow scope of management is not sufficient