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© Wiley 20101 Chapter 9– Capacity Planning & Facility Location Operations Management by R. Dan Reid & Nada R. Sanders 4th Edition © Wiley 2010.

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Presentation on theme: "© Wiley 20101 Chapter 9– Capacity Planning & Facility Location Operations Management by R. Dan Reid & Nada R. Sanders 4th Edition © Wiley 2010."— Presentation transcript:

1 © Wiley Chapter 9– Capacity Planning & Facility Location Operations Management by R. Dan Reid & Nada R. Sanders 4th Edition © Wiley 2010

2 © Wiley Learning Objectives Define capacity planning Define location analysis Describe relationship between capacity planning and location, and their importance Explain the steps involved in capacity planning and location analysis

3 © Wiley Learning Objectives – cont Describe the decision support tools used for capacity planning Identify key factors in location analysis Describe the decision support tools used for location analysis

4 © Wiley Capacity planning Capacity is the maximum output rate of a facility Capacity planning is the process of establishing the output rate that can be achieved at a facility: Capacity is usually purchased in chunks Strategic issues: how much and when to spend capital for additional facility & equipment Tactical issues: workforce & inventory levels, & day-to-day use of equipment

5 © Wiley Measuring Capacity Examples There is no one best way to measure capacity Output measures like kegs per day are easier to understand With multiple products, inputs measures work better

6 © Wiley Measuring Available Capacity Design capacity: Maximum output rate under ideal conditions A bakery can make 30 custom cakes per day when pushed at holiday time Effective capacity: Maximum output rate under normal (realistic) conditions On the average this bakery can make 20 custom cakes per day

7 © Wiley Measuring Effectiveness of Capacity Use Measures how much of the available capacity is actually being used: Measures effectiveness Use either effective or design capacity in denominator

8 © Wiley Example of Computing Capacity Utilization: A bakerys design capacity is 30 custom cakes per day. Currently the bakery is producing 28 cakes per day. What is the bakerys capacity utilization relative to both design and effective capacity? The current utilization is only slightly below its design capacity and considerably above its effective capacity The bakery can only operate at this level for a short period of time

9 © Wiley Capacity Considerations The Best Operating Level is the output that results in the lowest average unit cost Economies of Scale: Where the cost per unit of output drops as volume of output increases Spread the fixed costs of buildings & equipment over multiple units, allow bulk purchasing & handling of material Diseconomies of Scale: Where the cost per unit rises as volume increases Often caused by congestion (overwhelming the process with too much work-in-process) and scheduling complexity

10 © Wiley Best Operating Level and Size Alternative 1: Purchase one large facility, requiring one large initial investment Alternative 2: Add capacity incrementally in smaller chunks as needed

11 © Wiley Other Capacity Considerations Focused factories: Small, specialized facilities with limited objectives Plant within a plant (PWP): Segmenting larger operations into smaller operating units with focused objectives Subcontractor networks: Outsource non-core items to free up capacity for what you do well

12 © Wiley Making Capacity Planning Decisions The three-step procedure for making capacity planning decisions is as follows: 1.Identify Capacity Requirements 2.Develop Capacity Alternatives 3.Evaluate Capacity Alternatives

13 © Wiley Identifying capacity requirements Forecasting Capacity: Long-term capacity requirements based on future demand Identifying future demand based on forecasting Forecasting, at this level, relies on qualitative forecast models Executive opinion Delphi method Forecast and capacity decision must included strategic implications Capacity cushions Plan to underutilize capacity to provide flexibility Strategic Implications How much capacity a competitor might have Potential for overcapacity in industry a possible hazard

14 © Wiley Developing & Evaluating Capacity Alternatives Capacity alternatives include Could do nothing, expand large now (may included capacity cushion), or expand small now with option to add later Use decision support aids to evaluate decisions (decision tree most popular)

15 © Wiley Decision trees Diagramming technique which uses Decision points – points in time when decisions are made, squares called nodes Decision alternatives – branches of the tree off the decision nodes Chance events – events that could affect a decision, branches or arrows leaving circular chance nodes Outcomes – each possible alternative listed

16 © Wiley Decision tree diagrams Decision trees developed by Drawing from left to right Use squares to indicate decision points Use circles to indicate chance events Write the probability of each chance by the chance (sum of associated chances = 100%) Write each alternative outcome in the right margin

17 © Wiley Example Using Decision Trees: A restaurant owner has determined that she needs to expand her facility. The alternatives are to expand large now and risk smaller demand, or expand on a smaller scale now knowing that she might need to expand again in three years. Which alternative would be most attractive? (see notes)

18 © Wiley Evaluating the Decision Tree Decision tree analysis utilizes expected value analysis (EVA) EVA is a weighted average of the chance events Probability of occurrence * chance event outcome Refer to previous slide At decision point 2, choose to expand to maximize profits ($200,000 > $150,000) Calculate expected value of small expansion: EV small = 0.30($80,000) ($200,000) = $164,000

19 © Wiley Evaluating the Decision Tree cont Calculate expected value of large expansion: EV large = 0.30($50,000) ($300,000) = $225,000 At decision point 1, compare alternatives & choose the large expansion to maximize the expected profit: $225,000 > $164,000 Choose large expansion despite the fact that there is a 30% chance its the worst decision: Take the calculated risk!

20 © Wiley Location Analysis Three most important factors in real estate: 1. Location 2. Location 3. Location Facility location is the process of identifying the best geographic location for a service or production facility

21 © Wiley Factors Affecting Location Decisions Proximity to source of supply: Reduce transportation costs of perishable or bulky raw materials Proximity to customers: High population areas, close to JIT partners Proximity to labor: Local wage rates, attitude toward unions, availability of special skills (silicon valley)

22 © Wiley More Location Factors Community considerations: Local communitys attitude toward the facility (prisons, utility plants, etc.) Site considerations: Local zoning & taxes, access to utilities, etc. Quality-of-life issues: Climate, cultural attractions, commuting time, etc. Other considerations: Options for future expansion, local competition, etc.

23 © Wiley Globalization – Should Firm Go Global? Globalization is the process of locating facilities around the world Potential advantages: Inside track to foreign markets, avoid trade barriers, gain access to cheaper labor Potential disadvantages: Political risks may increase, loss of control of proprietary technology, local infrastructure (roads & utilities) may be inadequate, high inflation Other issues to consider: Language barriers, different laws & regulations, different business cultures

24 © Wiley Making Location Decisions Analysis should follow 3 step process: 1.Identify dominant location factors 2.Develop location alternatives 3.Evaluate locations alternatives Procedures for evaluation location alternatives include Factor rating method Load-distance model Center of gravity approach Break-even analysis Transportation method

25 © Wiley Factor Rating Example

26 © Wiley A Load-Distance Model Example: Matrix Manufacturing is considering where to locate its warehouse in order to service its four Ohio stores located in Cleveland, Cincinnati, Columbus, Dayton. Two sites are being considered; Mansfield and Springfield, Ohio. Use the load-distance model to make the decision. Calculate the rectilinear distance: Multiply by the number of loads between each site and the four cities

27 © Wiley Calculating the Load-Distance Score for Springfield vs. Mansfield The load-distance score for Mansfield is higher than for Springfield. The warehouse should be located in Springfield.

28 © Wiley The Center of Gravity Approach This approach requires that the analyst find the center of gravity of the geographic area being considered Computing the Center of Gravity for Matrix Manufacturing Is there another possible warehouse location closer to the C.G. that should be considered?? Why?

29 © Wiley Break-Even Analysis Break-even analysis computes the amount of goods required to be sold to just cover costs Break-even analysis includes fixed and variable costs Break-even analysis can be used for location analysis especially when the costs of each location are known Step 1: For each location, determine the fixed and variable costs Step 2: Plot the total costs for each location on one graph Step 3: Identify ranges of output for which each location has the lowest total cost Step 4: Solve algebraically for the break-even points over the identified ranges

30 © Wiley Break-Even Analysis Remember the break even equations used for calculation total cost of each location and for calculating the breakeven quantity Q. Total cost = F + cQ Total revenue = pQ Break-even is where Total Revenue = Total Cost Q = F/(p-c) Q = break-even quantity p = price/unit c = variable cost/unit F = fixed cost

31 © Wiley Example using Break-even Analysis: Clean-Clothes Cleaners is considering four possible sites for its new operation. They expect to clean 10,000 garments. The table and graph below are used for the analysis.

32 © Wiley The Transportation Method Can be used to solve specific location problems Is discussed in detail in the supplement to this text Could be used to evaluate the cost impact of adding potential location sites to the network of existing facilities Could also be used to evaluate adding multiple new sites or completely redesigning the network

33 © Wiley Capacity Planning & Facility Location within OM Decisions about capacity and location are highly dependent on forecasts of demand (Ch 8). Capacity is also affected by operations strategy (Ch 2), as size of capacity is a key element of organizational structure. Other operations decisions that are affected by capacity and location are issues of job design and labor skills (Ch 11), choice on the mix of labor and technology, as well as choices on technology and automation (Ch 3).

34 © Wiley Capacity Planning and Facility Location Across the Organization Capacity planning and location analysis affect operations management and are important to many others Finance provides input to finalize capacity decisions Marketing impacted by the organizational capacity and location to customers

35 © Wiley Chapter 9 Highlights Capacity planning is deciding on the maximum output rate of a facility Location analysis is deciding on the best location for a facility Capacity planning and location analysis decision are often made simultaneously because the location of the facility is usually related to its capacity.

36 © Wiley Chapter 9 Highlights – cont In both capacity planning and location analysis, managers must follow three-step process to make good decision. The steps are assessing needs, developing alternatives, and evaluating alternatives. To choose between capacity planning alternatives managers may use decision trees, which are a modeling tool for evaluating independent decisions that must be made in sequence.

37 © Wiley Chapter 9 Highlights – cont Key factors in location analysis included proximity to customers, transportation, source of labor, community attitude, and proximity to supplies. Service and manufacturing firms focus on different factors. Profit-making and nonprofit organizations also focus on different factors.

38 © Wiley Chapter 9 Highlights – cont Several tools can be used to facilitate location analysis. Factor rating is a tool that helps managers evaluate qualitative factors. The load- distance model and center of gravity approach evaluate the location decision based on distance. Break-even analysis is used to evaluate location decisions based on cost values. The transportation method is an excellent tool for evaluating the cost impact of adding sites to the network of current facilities.

39 Chapter 9 Homework Hints Problem 9.5: calculate utilizations based on design and effective capacities (see example 9.1). Present conclusions. Problem 9.14: use factor rating method to compare the possible locations (see example 9.3). Problem 9.15: use load-distance model to compare locations (see example 9.4). Problem 9.16: use center-of-gravity method. Use data from problem 15 (e.g. load between city and warehouse) to determine desired coordinates for the new warehouse.

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