In this paper obsolescence of service parts is analyzed in a practical environment. Based on the analysis, we propose a method that can be used to estimate the risk of obsolescence of service parts. The method distinguishes groups of service parts. For these groups, the risk of obsolescence is estimated using the behavior of similar groups of service parts in the past. The method uses demand data as main information source, and can therefore be applied without the use of an expert's opinion. We will give numerical values for the risk of obsolescence obtained with the method, and the e®ects of these values on inventory control will be examined.

forecasting, inventory, obsolescence, spare parts
Erasmus School of Economics
Econometric Institute Research Papers
Report / Econometric Institute, Erasmus University Rotterdam
Erasmus School of Economics

van Jaarsveld, W.L. (2010). Estimating obsolescence risk from demand data - a case study (No. EI 2010-03). Report / Econometric Institute, Erasmus University Rotterdam (pp. 1–14). Erasmus School of Economics. Retrieved from