AN EXPERT SIMULATION SYSTEM FOR AIDING MATERIAL INVENTORY CONTROL DECISION-MAKING IS DISCUSSED IN THIS PAPER. AN EXPERT SYSTEM, SIMULATION MODELS, DATABASE MANAGEMENT, QUANTITATIVE INVENTORY CONTROL TECHNIQUES ARE USED IN THIS SYSTEM. USING PC-PLUS EXPERT SHELL, SIMAN SIMULATION LANGUAGE AND DBASEIII-PLUS DATABASE MANAGEMENT SYSTEM, THE AUTHORS DEVELOPED SOME RELEVANT PROGRAMS.