STRATEGIC CAPACITY MANAGEMENT Chapter Five Copyright © 2014 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin.

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Presentation transcript:

STRATEGIC CAPACITY MANAGEMENT Chapter Five Copyright © 2014 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin

Economies of Scale Made of Steel  The Economics of Very Big Ships  Economy of Container Ships  Allows a T-shirt made in China to be sent to the Netherlands for just 2.5 cents.  The Eleonora Maersk and the other seven ships in her class are among the largest ever built:  Almost 400 m long, or the length of four soccer fields, and another half-field across.  The ships can carry 7,500 or so 40-foot containers, each of which can hold 70,000 T-shirts.  On this voyage, the Eleonora was carrying supplies for Europe’s New Year celebrations: 1,850 tons of fireworks, including 30 tons of gunpowder. 5-2

Capacity Management in Operations  Capacity – the ability to hold, receive, store, or accommodate  In business, viewed as the amount of output that a system is capable of achieving over a specific period of time  Capacity management needs to consider both inputs and outputs 5-3

Capacity Planning Time Durations Greater than one year Long range Monthly or quarterly plans covering the next 6 to 18 months Intermediate range Less than one month Short range 5-4

Strategic Capacity Planning  Determining the overall level of capacity-intensive resources that best supports the company’s long- range competitive strategy  Facilities  Equipment  Labor force size 5-5

Capacity Planning Concepts  Capacity utilization rate – a measure of how close the firm is to its best possible operating level  Economies of scale – the idea that as a planet gets larger and volume increases, the average cost per unit tends to drop  Diseconomies of scale – at some point, the plant becomes too large and average cost per unit begins to increase 5-6

Operations and Supply Chain Processes 1-7

Capacity Planning Concepts  Capacity focus – the idea that a production facility works best when it is concentrated on a limited set of production objectives  Focused factory or plant within a plant (PWP) concept  Capacity flexibility – the ability to rapidly increase or decrease product levels or the ability to shift rapidly from one product or service to another  Comes from the plant, processes, and workers or from strategies that use the capacity of other organizations 5-8

Capacity Flexibility Ability to quickly adapt to change Zero-changeover time Flexible Plants Flexible manufacturing systems Simple, easily set up equipment Flexible Processes Ability to switch from one kind of task to another quickly Multiple skills (cross training) Flexible Workers 5-9

Considerations in Changing Capacity Similar capacities desired at each operation Manage bottleneck operations Maintaining System Balance Cost of upgrading too frequently Cost of upgrading too infrequently Frequency of Capacity Additions Outsourcing Sharing capacity External Sources of Capacity Temporary reductions Permanent reductions Decreasing Capacity 5-10

Frequent versus Infrequent Capacity Expansions 5-11

Determining Capacity Requirements Use forecasting to predict sales for individual products Calculate labor and equipment requirements to meet forecasts Project labor and equipment availability over the planning horizon 5-12

Planning Service Capacity Manufacturing Capacity Goods can be stored for later use. Goods can be shipped to other locations. Volatility of demand is relatively low. Service Capacity Capacity must be available when service is needed – cannot be stored. Service must be available at customer demand point. Much higher volatility is typical. 5-13

Capacity Utilization and Service Quality  The relationship between service capacity utilization and service quality is critical.  Utilization is measured by the portion of time servers are busy.  Optimal levels of utilization are context specific.  Low rates are appropriate when the degree of uncertainty (in demand) is high and/or the stakes are high (e.g., emergency rooms, fire departments).  Higher rates are possible for predictable services or those without extensive customer contact (e.g., commuter trains, postal sorting). 5-14

Service Quality  Rate of service utilization and service quality are directly linked Arrivals exceed services – many customers are never served Sufficient capacity to provide quality service Service quality declines – disruptions or high arrival levels lead to long wait times