1 OMGT 4743/6743 Aggregate Production Planning (APP) Matches market demand to company resources Plans production 6 months to 12 months in advance Expresses.

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Presentation transcript:

1 OMGT 4743/6743 Aggregate Production Planning (APP) Matches market demand to company resources Plans production 6 months to 12 months in advance Expresses demand, resources, and capacity in general terms Develops a strategy for economically meeting demand Establishes a companywide game plan for allocating resources

2 OMGT 4743/6743 Inputs and Outputs to Aggregate Production Planning Aggregate Production Planning Company Policies Financial Constraints Strategic Objectives Units or dollars subcontracted, backordered, or lost Capacity Constraints Size of Workforce Production per month (in units or $) Inventory Levels Demand Forecasts

3 OMGT 4743/6743 Strategies for Meeting Demand 1. Use inventory to absorb fluctuations in demand (level production) 2. Hire and fire workers to match demand (chase demand) 3. Maintain resources for high demand levels 4. Increase or decrease working hours (over & undertime) 5. Subcontract work to other firms 6. Use part-time workers 7. Provide the service or product at a later time period (backordering)

4 OMGT 4743/6743 Strategy Details Level production - produce at constant rate & use inventory as needed to meet demand Chase demand - change workforce levels so that production matches demand Maintaining resources for high demand levels - ensures high levels of customer service Overtime & undertime - common when demand fluctuations are not extreme

5 OMGT 4743/6743 Strategy Details Subcontracting - useful if supplier meets quality & time requirements Part-time workers - feasible for unskilled jobs or if labor pool exists Backordering - only works if customer is willing to wait for product/services

6 OMGT 4743/6743 Level Production Time Production Demand Units

7 OMGT 4743/6743 Chase Demand Time Units Production Demand

8 OMGT 4743/6743 APP Using Pure Strategies Hiring cost = $100 per worker Firing cost = $500 per worker Inventory carrying cost = $0.50 pound per quarter Production per employee = 1,000 pounds per quarter Beginning work force = 100 workers QuarterSales Forecast (lb) Spring80,000 Summer50,000 Fall120,000 Winter150,000

9 OMGT 4743/6743 Level Production Strategy SalesProduction QuarterForecastPlanInventory Spring80,000100,00020,000 Summer50,000100,00070,000 Fall120,000100,00050,000 Winter150,000100, ,000140,000 Cost = 140,000 pounds x 0.50 per pound = $70,000

10 OMGT 4743/6743 Chase Demand Strategy SalesProductionWorkersWorkersWorkers QuarterForecastPlanNeededHiredFired Spring80,00080, Summer50,00050, Fall120,000120, Winter150,000150, Cost = (100 workers hired x $100) + (50 workers fired x $500) = $10, ,000 = $35,000

11 OMGT 4743/6743 Other Quantitative Techniques Linear programming Linear decision rule (LDR) Search decision rule (SDR) Management coefficients model

12 OMGT 4743/6743 Strategies for Managing Demand Shift demand into other periods –incentives, sales promotions, advertising campaigns Offer product or services with countercyclical demand patterns –create demand for idle resources

13 OMGT 4743/6743 Hierarchical Planning Process Items Product lines or families Individual products Components Manufacturing operations Resource level Plants Individual machines Critical work centers Production PlanningCapacity Planning Resource Requirements Plan Rough-Cut Capacity Plan Capacity Requirements Plan Input/Output Control Aggregate Production Plan Master Production Schedule Material Requirements Plan Shop Floor Schedule All work centers

14 OMGT 4743/6743 Aggregate Planning for Services 1. Most services can’t be inventoried 2. Demand for services is difficult to predict 3. Capacity is also difficult to predict 4. Service capacity must be provided at the appropriate place and time 5. Labor is usually the most constraining resource for services