EFFECT OF ERRORS AND DELAYS IN INVENTORY REPORTING ON PRODUCTION SYSTEM PERFORMANCE

A discrete linear control representation has been used by the authors to examine the performance of multi-level, multi-product production co ntrol systems operating in an environment where system errors are expe cted. The basic method was reported in [1] and its use to examine syst em structures and system implementation sequences was discussed in [2] . Production control systems operate in an uncertain environment. Besi des the commonly considered uncertainties in demand, yield, quality an d delivery times, errors frequently exist in basic data such as bills of materials and occur in stock records as a result of incorrect or la te transaction recording. This paper presents the basic discrete linea r control representation of MRP and ROC systems, shows how these repre sentations may be modified to include certain types of internal system error, before examining the effects of delays in stock recording and of recording errors on the performance of the system. Performance meas ures include the effects on schedules, planned stock and delivery perf ormance.