Inventory control Production control 10 Mathematical models 8 Data processing 5 Management 4 Production management 4 Production planning 4 Materials management 3 Accounting 2 Business forecasting 2 Cash management 2 Decision making 2 Just-in-time systems 2 Spare parts 2 Supply and demand 2 Accounts receivable 1 Command and control systems 1 Computer simulation 1 Congresses 1 Contracts 1 Corporations 1 Costs 1 Credit 1 Demand functions (Economic theory) 1 Finance 1 Food service 1 Forecasting 1 Government policy 1 Government purchasing 1 Hospital purchasing 1