The effects of work‐in‐process inventory considerations on learning curve construction
研究了在制品库存对学习曲线构建的影响，通过实际工业数据使用线性和双线性制造进度函数，发现考虑在制品库存会改变学习曲线百分比，且纳入该参数比具体方法更重要。
Abstract Learning curves have been used since the 1930's as a tool to aid in the functions of cost estimating and production planning / control. While there has been much data collected to construct learning curves for airplanes, extensive coll ection of data to construct curves for electronic equipment has been limited. Further, virtually all published analyses to date have implicitly ignored the effects of work‐in‐process inventories on curve construction. This paper examines these effects through the historical construction of learning curves using actual industrial data. Work‐in‐process effects are considered through the use of linear and bilinear manufacturing progress functions. Degradation in the accuracy of curve construction is determined through the completion of a sensitivity analysis considering varying degrees of work‐in‐process activity. The results of the analysis show that work‐in‐process consideration affects the improvement curve percentage obtained. The method of work‐in‐process consideration is found to be less critical than the basic inclusion of this parameter in curve construction by one of several straightforward mathematical methods.