1. © 2006 Prentice Hall, Inc.9 – 1 Layout Strategy Chapter9

2. © 2006 Prentice Hall, Inc.9 – 2 Innovations at McDonald’s  Indoor seating (1950s)  Drive-through window (1970s)  Adding breakfast to the menu (1980s)  Adding play areas (1990s) Three out of the four are layout decisions!

3. © 2006 Prentice Hall, Inc.9 – 3 McDonald’s New Kitchen Layout  Fifth major innovation  Sandwiches assembled in order  Elimination of some steps, shortening of others  No food prepared ahead except patty  New bun toasting machine and new bun formulation  Repositioning condiment containers  Savings of $100,000,000 per year in food costs

4. © 2006 Prentice Hall, Inc.9 – 4 Strategic Importance of Layout Decisions The objective of layout strategy is to develop an economic layout that will meet the firm’s competitive requirements

5. © 2006 Prentice Hall, Inc.9 – 5 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

6. © 2006 Prentice Hall, Inc.9 – 6 Types of Layout 1.Office layout - positions workers, their equipment, and spaces/offices to provide for movement of information 2.Retail layout - allocates shelf space and responds to customer behavior 3.Warehouse layout - addresses trade-offs between space and material handling

7. © 2006 Prentice Hall, Inc.9 – 7 Types of Layout 4.Fixed-position layout - addresses the layout requirements of large, bulky projects such as ships and buildings 5.Process-oriented layout - deals with low-volume, high-variety production (also called job shop or intermittent production)

8. © 2006 Prentice Hall, Inc.9 – 8 Types of Layout 6.Work cell layout - a special arrangement of machinery and equipment to focus on production of a single product or group of related products 7.Product-oriented layout - seeks the best personnel and machine utilizations in repetitive or continuous production

9. © 2006 Prentice Hall, Inc.9 – 9 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

10. © 2006 Prentice Hall, Inc.9 – 10 Office Layout  Grouping of workers, their equipment, and spaces to provide comfort, safety, and movement of information  Movement of information is main distinction  Typically in state of flux due to frequent technological changes

11. © 2006 Prentice Hall, Inc.9 – 11 Relationship Chart ValueCloseness A Absolutely necessary E Especially important IImportant OOrdinary OK UUnimportant XNot desirable President Chief Technology Officer Engineer’s area Secretary Office entrance Central files Equipment cabinet Photocopy equipment Storage room O U A X O U A I O A I O U A I I A U O A U O U X O I U O I I I E E E E E12 3 4 5 6 7 8 9 Figure 9.1

12. © 2006 Prentice Hall, Inc.9 – 12 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

13. © 2006 Prentice Hall, Inc.9 – 13 Supermarket Retail Layout  Objective is to maximize profitability per square foot of floor space  Sales and profitability vary directly with customer exposure

14. © 2006 Prentice Hall, Inc.9 – 14 Five Helpful Ideas for Supermarket Layout 1.Locate high-draw items around the periphery of the store 2.Use prominent locations for high-impulse and high-margin items 3.Distribute power items to both sides of an aisle and disperse them to increase viewing of other items 4.Use end-aisle locations 5.Convey mission of store through careful positioning of lead-off department

15. © 2006 Prentice Hall, Inc.9 – 15 Retail Slotting  Manufacturers pay fees to retailers to get the retailers to display (slot) their product  Contributing factors  Limited shelf space  An increasing number of new products  Better information about sales through POS data collection  Closer control of inventory

16. © 2006 Prentice Hall, Inc.9 – 16 Retail Store Shelf Space Planogram  Computerized tool for shelf- space management  Generated from store’s scanner data on sales  Often supplied by manufacturer 5 facings Shampoo Conditioner Shampoo Conditioner 2 ft.

17. © 2006 Prentice Hall, Inc.9 – 17 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

18. © 2006 Prentice Hall, Inc.9 – 18 Warehousing and Storage Layouts  Objective is to optimize trade-offs between handling costs and costs associated with warehouse space  Maximize the total “cube” of the warehouse – utilize its full volume while maintaining low material handling costs

19. © 2006 Prentice Hall, Inc.9 – 19 Warehousing and Storage Layouts  Warehouse density tends to vary inversely with the number of different items stored  Automated Storage and Retrieval Systems (ASRS) can significantly improve warehouse productivity  Dock location is a key design element

20. © 2006 Prentice Hall, Inc.9 – 20 Cross-Docking  Materials are moved directly from receiving to shipping and are not placed in storage in the warehouse  Requires tight scheduling and accurate shipments, typically with bar code identification

21. © 2006 Prentice Hall, Inc.9 – 21 Shipping and receiving docks Office Customization Conveyor Storage racks Staging Warehouse Layout Traditional Layout

22. © 2006 Prentice Hall, Inc.9 – 22 Warehouse Layout Cross-Docking Layout Shipping and receiving docks Office Shipping and receiving docks

23. © 2006 Prentice Hall, Inc.9 – 23 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

24. © 2006 Prentice Hall, Inc.9 – 24 Fixed-Position Layout  Product remains in one place  Workers and equipment come to site  Complicating factors  Limited space at site  Different materials required at different stages of the project  Volume of materials needed is dynamic

25. © 2006 Prentice Hall, Inc.9 – 25 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

26. © 2006 Prentice Hall, Inc.9 – 26 Process-Oriented Layout  Like machines and equipment are grouped together  Flexible and capable of handling a wide variety of products or services  Scheduling can be difficult and setup, material handling, and labor costs can be high

27. © 2006 Prentice Hall, Inc.9 – 27 Surgery Radiology ER triage room ER BedsPharmacy Emergency room admissions Billing/exit Laboratories Process-Oriented Layout Patient A - broken leg Patient B -erratic heart pacemaker Figure 9.3

28. © 2006 Prentice Hall, Inc.9 – 28 Process-Oriented Layout  Arrange work centers so as to minimize the costs of material handling  Basic cost elements are  Number of loads (or people) moving between centers  Distance loads (or people) move between centers

29. © 2006 Prentice Hall, Inc.9 – 29 Process-Oriented Layout Minimize cost = ∑ ∑ X ij C ij n i = 1 n j = 1 wheren=total number of work centers or departments i, j=individual departments X ij =number of loads moved from department i to department j C ij =cost to move a load between department i and department j

30. © 2006 Prentice Hall, Inc.9 – 30 Process Layout Example 1.Construct a “from-to matrix” 2.Determine the space requirements 3.Develop an initial schematic diagram 4.Determine the cost of this layout 5.Try to improve the layout 6.Prepare a detailed plan Arrange six departments in a factory to minimize the material handling costs. Each department is 20 x 20 feet and the building is 60 feet long and 40 feet wide.

31. © 2006 Prentice Hall, Inc.9 – 31 DepartmentAssemblyPaintingMachineReceivingShippingTesting (1)(2)Shop (3)(4)(5)(6) Assembly (1) Painting (2) Machine Shop (3) Receiving (4) Shipping (5) Testing (6) Number of loads per week 501000020 3050100 200100 500 0 Process Layout Example Figure 9.4

32. © 2006 Prentice Hall, Inc.9 – 32 Room 1Room 2Room 3 Room 4Room 5Room 6 60’ 40’ Process Layout Example ReceivingShippingTesting DepartmentDepartmentDepartment (4)(5)(6) Figure 9.5 AssemblyPaintingMachine Shop DepartmentDepartmentDepartment (1)(2)(3)

33. © 2006 Prentice Hall, Inc.9 – 33 Process Layout Example Cost =$50+$200+$40 (1 and 2)(1 and 3)(1 and 6) +$30+$50+$10 (2 and 3)(2 and 4)(2 and 5) +$40+$100+$50 (3 and 4)(3 and 6)(4 and 5) = $570 Cost = ∑ ∑ X ij C ij n i = 1 n j = 1

34. © 2006 Prentice Hall, Inc.9 – 3410050 20 50 50 20 10 100 30 Process Layout Example Interdepartmental Flow Graph 123 456 Figure 9.6

35. © 2006 Prentice Hall, Inc.9 – 35 Process Layout Example Cost =$50+$100+$20 (1 and 2)(1 and 3)(1 and 6) +$60+$50+$10 (2 and 3)(2 and 4)(2 and 5) +$40+$100+$50 (3 and 4)(3 and 6)(4 and 5) = $480 Cost = ∑ ∑ X ij C ij n i = 1 n j = 1

36. © 2006 Prentice Hall, Inc.9 – 36 Process Layout Example 3050 10 50 50 20 50100 100 Interdepartmental Flow Graph 213 456 Figure 9.7

37. © 2006 Prentice Hall, Inc.9 – 37 Room 1Room 2Room 3 Room 4Room 5Room 6 60’ 40’ Process Layout Example ReceivingShippingTesting DepartmentDepartmentDepartment (4)(5)(6) Figure 9.8 Painting Assembly Machine Shop DepartmentDepartmentDepartment (2)(1)(3)

38. © 2006 Prentice Hall, Inc.9 – 38 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

39. © 2006 Prentice Hall, Inc.9 – 39 Work Cells  Reorganizes people and machines into groups to focus on single products or product groups  Group technology identifies products that have similar characteristics for particular cells  Volume must justify cells  Cells can be reconfigured as designs or volume changes

40. © 2006 Prentice Hall, Inc.9 – 40 Advantages of Work Cells 1.Reduced work-in-process inventory 2.Less floor space required 3.Reduced raw material and finished goods inventory 4.Reduced direct labor 5.Heightened sense of employee participation 6.Increased use of equipment and machinery 7.Reduced investment in machinery and equipment

41. © 2006 Prentice Hall, Inc.9 – 41 Improving Layouts Using Work Cells Current layout - workers in small closed areas. Cannot increase output without a third worker and third set of equipment. Improved layout - cross-trained workers can assist each other. May be able to add a third worker as additional output is needed. Figure 9.10 (a)

42. © 2006 Prentice Hall, Inc.9 – 42 Improving Layouts Using Work Cells Current layout - straight lines make it hard to balance tasks because work may not be divided evenly Improved layout - in U shape, workers have better access. Four cross-trained workers were reduced. Figure 9.10 (b) U-shaped line may reduce employee movement and space requirements while enhancing communication, reducing the number of workers, and facilitating inspection

43. © 2006 Prentice Hall, Inc.9 – 43 Requirements of Work Cells 1.Identification of families of products 2.A high level of training and flexibility on the part of employees 3.Either staff support or flexible, imaginative employees to establish work cells initially 4.Test (poka-yoke) at each station in the cell

44. © 2006 Prentice Hall, Inc.9 – 44 Types of Layout 1.Office layout 2.Retail layout 3.Warehouse layout 4.Fixed-position layout 5.Process-oriented layout 6.Work cell layout 7.Product-oriented layout

45. © 2006 Prentice Hall, Inc.9 – 45 Repetitive and Product- Oriented Layout  Volume is adequate for high equipment utilization  Product demand is stable enough to justify high investment in specialized equipment  Product is standardized or approaching a phase of life cycle that justifies investment  Supplies of raw materials and components are adequate and of uniform quality Organized around products or families of similar high-volume, low-variety products

46. © 2006 Prentice Hall, Inc.9 – 46 Product-Oriented Layouts  Fabrication line  Builds components on a series of machines  Machine-paced  Require mechanical or engineering changes to balance  Assembly line  Puts fabricated parts together at a series of workstations  Paced by work tasks  Balanced by moving tasks Both types of lines must be balanced so that the time to perform the work at each station is the same

47. © 2006 Prentice Hall, Inc.9 – 47 Product-Oriented Layouts 1.Low variable cost per unit 2.Low material handling costs 3.Reduced work-in-process inventories 4.Easier training and supervision 5.Rapid throughput Advantages 1.High volume is required 2.Work stoppage at any point ties up the whole operation 3.Lack of flexibility in product or production rates Disadvantages

48. © 2006 Prentice Hall, Inc.9 – 48 Assembly-Line Balancing  Objective is to minimize the imbalance between machines or personnel while meeting required output  Starts with the precedence relationships 1.Determine cycle time 2.Calculate theoretical minimum number of workstations 3.Balance the line by assigning specific tasks to workstations

49. © 2006 Prentice Hall, Inc.9 – 49 Copier Example This means that tasks B and E cannot be done until task A has been completed PerformanceTask Must Follow TimeTask Listed Task(minutes)Below A10— B11A C5B D4B E12A F3C, D G7F H11E I3G, H Total time 66

50. © 2006 Prentice Hall, Inc.9 – 50 Copier Example PerformanceTask Must Follow TimeTask Listed Task(minutes)Below A10— B11A C5B D4B E12A F3C, D G7F H11E I3G, H Total time 66 I G F C D H B E A 10 1112 5 4 3 7113 Figure 9.13

51. © 2006 Prentice Hall, Inc.9 – 51 I G F C D H B E A 10 1112 5 4 3 7113 Figure 9.13 PerformanceTask Must Follow TimeTask Listed Task(minutes)Below A10— B11A C5B D4B E12A F3C, D G7F H11E I3G, H Total time 66 Copier Example 480available mins per day 40units required Cycle time = Production time available per day Units required per day = 480 / 40 = 12 minutes per unit Minimum number of workstations = ∑ Time for task i Cycle time n i = 1 = 66 / 12 = 5.5 or 6 stations

52. © 2006 Prentice Hall, Inc.9 – 52 I G F C D H B E A 10 1112 5 4 3 7113 Figure 9.13 PerformanceTask Must Follow TimeTask Listed Task(minutes)Below A10— B11A C5B D4B E12A F3C, D G7F H11E I3G, H Total time 66 Copier Example 480available mins per day 40units required Cycle time = 12 mins Minimum workstations = 5.5 or 6 Line-Balancing Heuristics 1.Longest task timeChoose the available task with the longest task time 2.Most following tasksChoose the available task with the largest number of following tasks 3.Ranked positional weight Choose the available task for which the sum of following task times is the longest 4.Shortest task timeChoose the available task with the shortest task time 5.Least number of following tasks Choose the available task with the least number of following tasks Table 9.4

53. © 2006 Prentice Hall, Inc.9 – 53 480available mins per day 40units required Cycle time = 12 mins Minimum workstations = 5.5 or 6 PerformanceTask Must Follow TimeTask Listed Task(minutes)Below A10— B11A C5B D4B E12A F3C, D G7F H11E I3G, H Total time 66 Copier Example I GF H C D B E A 1011 12 5 4 37 11 3 Station 1 Station 2 Station 3 Station 5 Station 4 Station 6 Figure 9.14

54. © 2006 Prentice Hall, Inc.9 – 54 PerformanceTask Must Follow TimeTask Listed Task(minutes)Below A10— B11A C5B D4B E12A F3C, D G7F H11E I3G, H Total time 66 Copier Example 480available mins per day 40units required Cycle time = 12 mins Minimum workstations = 5.5 or 6 Efficiency = ∑ Task times (actual number of workstations) x (largest cycle time) = 66 minutes / (6 stations) x (12 minutes) = 91.7%