Presentation on theme: "1 Operations Management Process Analysis and Applications Module Changing Sources of Competitive Advantage Operational Measures: Time T, Inventory I, Throughput."— Presentation transcript:
1 Operations Management Process Analysis and Applications Module Changing Sources of Competitive Advantage Operational Measures: Time T, Inventory I, Throughput rate R Link through Littles Law Link to Financial Measures Levers for Improvement CRU Computer Rentals Capacity and Flow Time Analysis Pizza Pazza Levers for Improvement Multi-product Capacity Management and Investment Joint Marketing & Production Decisions Optimal Capacity Investment National Cranberry Cooperative
2 How can operations help a company compete? The changing sources of competitive advantage Low Cost & Scale Economies (< 1960s) –You can have any color you want as long as it is black Focused Factories (mid 1960s) Flexible Factories and Product variety (1970s) –A car for every taste and purse. Quality (1980s) –Quality is free. Time (late 1980s-1990s) –We love your product but where is it? –Dont sell what you produce. Produce what sells. PVQTPVQT
5 Operational Performance Measures Flow time T Throughput rate R Inventory I Process Cost
6 Relating operational measures (flow time T, throughput R & inventory I) with Littles Law Inventory = Throughput x Flow Time I = R x T Turnover = Throughput / Inventory = 1/ T Inventory I [units] Flow rate/Throughput R [units/hr]... Flow Time T [hrs]
7 Process Flow Examples Customer Flow: Taco Bell processes on average 1,500 customers per day (15 hours). On average there are 75 customers in the restaurant (waiting to place the order, waiting for the order to arrive, eating etc.). How long does an average customer spend at Taco Bell and what is the average customer turnover? Monetary Flow: A major manufacturer sells $300 million worth of cellular equipment per year. Average amount in accounts receivables is $45million. How long does it take to process a sales order in accounts receivable? Job Flow: The Travelers Insurance Company processes 10,000 claims per year. The average processing time is 3 weeks. Assuming 50 weeks in a year, what is the average number of claims in process?
8 Process Flow Examples Is she right? A general manager at Baxter states that her inventory turns three times a year. She also states that everything that Baxter buys gets processed and leaves the docks within six weeks. Are these statements consistent?
9 EXAMPLE 3.2 : MBPF Inc. MBPF Inc. manufactures prefabricated garages. Purchase sheet material, forms and assembles the finished product. Each garage needs a roof, a base. Goal : To understand how long and where a $ spends time in MBPF process. Where should we improve the flow time?
14 Raw Materials (roofs) Fabrication (roofs) $60.2/yr Assembly $25.3/yr Purchased Parts (bases) Finished Goods $6.5 $50.1/yr $40.2/yr $8.6 $15.1 $10.6 $110.3/yr $40.2/yr $175.8/yr $9.8 $175.8/yr MBPF Business Process Flows
15 Flow rate R ($/week) 0.96 Flow Time T (weeks) Accounts Receivable Finished Goods Assembly Fabrication Raw Materials Purchased Parts 11.126.75 7.12 3.142.90 5.80 0.77 2.12 3.38 5.0 MBPF Inc.: Flow Times
16 CRU COMPUTER RENTALS (to be distributed in class)
17 Capacity & Flow Time Analysis Pizza Pazza: Flow Chart startTake OrderSauce PrepDough PrepSpread Activity time:231 Resource:Jean Jean, Pan Batch size:331 endBill Unload & Pack Bake Load & Set timer Activity time:21151 Resource:JaquelineJaqueline, PanOven, PanJaqueline, Oven, Pan Batch size:3122 3 cool Time for order of 2 pizzas: 232 22151
18 Pizza Pazza: Flow Time Analysis 2.What is the minimum time to fill a rush order, assuming that all steps of the process are started only after the order is received? Without spending money, how would you reduce this response time? 3.What is the maximum number of orders that PP can fill per hour in steady state? 4.Assume that there are four orders waiting to be processed, Jean is just about to start mixing the sauce for another two pizzas (a fifth order) and Jacqueline is just about to start loading two pizza pans into the oven (a sixth order). A customer calls in with a new pizza order and wants to know when she can pick up her order. What due-date time should Jean promise assuming that she processes all orders in the sequence received?
19 Operational Measure: Flow Time Driver: Activity Times Critical Path: Theoretical Flow Time: Average Flow Time:
20 Most Time Inefficiency Comes from Waiting: Flow Times in White Collar Processes
21 Levers for Reducing Flow Time Decrease the work content of critical activities. –work smarter. –work faster. –do it right the first time. –change product mix. Move work content from critical to non-critical activities. –to non-critical path or to outer loop. Reduce waiting time.
22 A Recipe for Capacity Measurements * assuming system is processing at full capacity
23 A Recipe for Capacity Measurements * assuming system is processing at full capacity
24 A Recipe for Capacity Measurements * assuming system is processing at full capacity and order size = 2 pizzas
25 Pizza Pazza: Flow Rate/Capacity Analysis 1.What is the minimum number of pizza pans needed to ensure that no order has to wait for a pan? 2.If the Jacqueline calls in sick one day, what is the maximum number of orders that PP can fill?
26 A Recipe for Capacity Measurements * assuming system is processing at full capacity
27 A Recipe for Capacity Measurements * assuming system is processing at full capacity
28 Pricing: Wages and Quantity Discounts 1.Assume Jean and Jacqueline decide to hire two employees to perform their respective tasks; each paid 8 per hour. What is the contribution margin (revenue - variable costs) generated per hour of operation of the process if pizzas sell for 5 each? What is the minimum amount that Jean can charge per pizza, and still make a profit? –Resource cost = –Material cost = –Contribution margin if sale price is 5 = –Minimum sale price = 2.Is it worth offering any discount to encourage all orders to be for three pizzas? If so, how much?
29 A Recipe for Capacity Measurements * assuming system is processing at full capacity
30 Capacity Investments: Another oven? Task reallocation 1.The pizzas have become wildly popular and Jean feels that they can easily sell twenty pizzas per hour. To increase capacity, he is thinking of renting another industrial oven, which would cost 10 for each hour that the oven is used. Do you think it is worthwhile for Jean to rent the oven if the rest of the process is kept as is (assume that Jean and Jacqueline are doing the tasks)? What would be the contribution margin from each hour of operation of the process? –Resource cost = –Material cost = –Contribution margin if sale price is 5 = 2.Can you think of ways to increase profits by reallocating tasks between the employees?
31 A Recipe for Capacity Measurements * assuming system is processing at full capacity
32 Other factors affecting Process Capacity Batch (Order) Sizes: –Is it worth offering any discount to encourage all orders to be for 3 pizzas if we have 2 ovens? If so, how much? Product Mix: see later other managerial policies...
33 Operational Measure: Capacity Drivers: Resource Loads (Theoretical) Capacity of a Resource Bottleneck Resource (Theoretical) Capacity of the Process Capacity Utilization of a Resource/Process = throughput [units/hr] capacity [units/hr]
34 Levers for Increasing Process Capacity Decrease the work content of bottleneck activities –work smarter –work faster –do it right the first time –change product mix Move work content from bottlenecks to non-bottlenecks –create flexibility to handle tasks originally assigned to bottleneck –to non-critical resource or to third party Increase Net Availability –work longer: increase scheduled availability –increase scale (invest) –increase size of load batches/reduce or eliminate setups & changeovers
35 Increasing Process Capacity in The Goal is to increase the capacity of only the bottlenecks –ensure the bottlenecks time is not wasted increase availability of bottleneck resources eliminate non-value added work from bottlenecks –reduce/eliminate setups and changeovers synchronize flows to & from bottleneck –reduce starvation & blockage – the load of the bottlenecks (give it to non-bottlenecks) move work from bottlenecks to non-bottlenecks need resource flexibility – unit capacity and/or #of units. invest
36 Product Mix Decisions: Pizza Pazza offers 2 pizza types Sale Price of thin crust:5 Cost of Materials:1.40 Sale Price of deep dish:7.50 Cost of Materials: 1.90 Which of these two products should Jean push to customers that call in and are undecided?
37 A Recipe for Capacity Measurements * assuming system is processing at full capacity Suppose they take the same processing except that deep dish require 5 min (vs 2) in sauce prep and 29 min (vs 15) in baking.
38 Product Mix Decisions Margin of thin crust pizza = 3.60 Margin of deep dish pizza = 5.60 Margin per oven minute from thin crust = 2*3.60 / 16 min = 0.45/min Margin per oven minute from deep dish = 2*5.60 / 30 min = 0.36/min
40 Learning Objectives Module 2: Multi-Product Process Analysis & Apps Manage better with the three key operational measures and an inter- functional macro process view of the organization: Process measures: –Flow time manage critical activities –Capacity manage bottleneck resources Levers for improving –Flow time manage critical activities –Capacity & Throughput Process capacity depends on a zillion things –Effect of product mix decisions on process capacity marginal contribution per unit of bottleneck capacity used –Bottleneck may shift on adding capacity è diminishing returns to capacity investment