AN ECONOMIC-EVALUATION MODEL FOR ADVANCED MANUFACTURING SYSTEMS USINGACTIVITY-BASED COSTING

The development of traditional cost accounting (TCA) systems is based on the mass production of a mature product with known characteristics and a stable technology In particular the traditional investment decis ions in manufacturing are made based on cost accounting data collected for the production setting given, where the cost structure and uncert ainty (in demand, actual costs, or delivery times) are assumed exogeno us to the system. Recent manufacturing experience suggests, however, t hat these assumptions-stable product and mass production-are no longer valid for advanced manufacturing systems (AMSs). Thus, manufacturing companies have reduced their dependence on TCA systems by exploring ac tivity-based cost (Asc) systems. Because TCA and ABC systems have diff erent means of handling overhead costs, they may also have differences in their estimates of cash flows with cost accounting data. We will d evelop costing procedures for various manufacturing activities under A BC systems, and these procedures are incorporated into the proposed mu ltistage investment decision model. Finally, a case study is presented to demonstrate the application of the economic decision model, and we conclude that opportunity costs such as waiting activity and idle act ivity play more critical roles than the right choice of cost accountin g system in justifying investment in an AMS.