McGraw-Hill/Irwin Copyright © 2008 by The McGraw-Hill Companies, Inc. All rights reserved. Service Processes CHAPTER 5.

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Presentation transcript:

McGraw-Hill/Irwin Copyright © 2008 by The McGraw-Hill Companies, Inc. All rights reserved. Service Processes CHAPTER 5

5-2 Learning Objectives After completing the chapter you will: Understand the characteristics of service processes and how they are different from manufacturing processes Be able to classify service processes Understand what waiting line (queuing) analysis is Be able to model some common waiting line situations and estimate server utilization, the length of the waiting line, and average customer wait time

5-3 Service Businesses Generally classified according to who the customer is: Financial services Health care A contrast to manufacturing A service business is the management of organizations whose primary business requires interaction with the customer to produce the service

5-4 Service-System Design Matrix Mail contact Face-to-face loose specs Face-to-face tight specs Phone Contact Face-to-face total customization Buffered core (none) Permeable system (some) Reactive system (much) High Low High Low Degree of customer/server contact Internet & on-site technology Sales Opportunity Production Efficiency

5-5 Characteristics of Workers, Operations, and Innovations Relative to the Degree of Customer/Service Contact

5-6 Components of the Queuing System Customer Arrivals Servers Waiting Line Servicing System Exit Queue or

5-7 Customer Service Population Sources Population Source FiniteInfinite Example: Number of machines needing repair when a company only has three machines. Example: The number of people who could wait in a line for gasoline.

5-8 Service Pattern Service Pattern ConstantVariable Example: Items coming down an automated assembly line. Example: People spending time shopping.

5-9 The Queuing System Queue Discipline Length Number of Lines & Line Structures Service Time Distribution Queuing System

5-10 Examples of Line Structures Single Channel Multichannel Single Phase Multiphase One-person barber shop Car wash Hospital admissions Bank tellers’ windows

5-11 Degree of Patience No Way! BALK No Way! RENEG

5-12 Waiting Line Models ModelLayout Source PopulationService Pattern 1Single channelInfiniteExponential 2Single channelInfiniteConstant 3MultichannelInfiniteExponential These three models share the following characteristics:  Single phase  Poisson arrival  FCFS  Unlimited queue length

5-13 Notation: Infinite Queuing: Models 1-3

5-14 Infinite Queuing Models 1-3 (Continued)

5-15 Assume a drive-up window at a fast food restaurant. Customers arrive at the rate of 25 per hour. The employee can serve one customer every two minutes. Assume Poisson arrival and exponential service rates. Determine: A) What is the average utilization of the employee? B) What is the average number of customers in line? C) What is the average number of customers in the system? D) What is the average waiting time in line? E) What is the average waiting time in the system? F) What is the probability that exactly two cars will be in the system? Determine: A) What is the average utilization of the employee? B) What is the average number of customers in line? C) What is the average number of customers in the system? D) What is the average waiting time in line? E) What is the average waiting time in the system? F) What is the probability that exactly two cars will be in the system? Example: Model 1

5-16 A) What is the average utilization of the employee?

5-17 Example: Model 1 B) What is the average number of customers in line? C) What is the average number of customers in the system?

5-18 Example: Model 1 D) What is the average waiting time in line? E) What is the average waiting time in the system?

5-19 Example: Model 1 F) What is the probability that exactly two cars will be in the system (one being served and the other waiting in line)?

5-20 Example: Model 2 An automated pizza vending machine heats and dispenses a slice of pizza in 4 minutes. Customers arrive at a rate of one every 6 minutes with the arrival rate exhibiting a Poisson distribution. Determine: A) The average number of customers in line. B) The average total waiting time in the system. Determine: A) The average number of customers in line. B) The average total waiting time in the system.

5-21 Example: Model 2 A) The average number of customers in line. B) The average total waiting time in the system.

5-22 Example: Model 3 Recall the Model 1 example: Drive-up window at a fast food restaurant. Customers arrive at the rate of 25 per hour. The employee can serve one customer every two minutes. Assume Poisson arrival and exponential service rates. If an identical window (and an identically trained server) were added, what would the effects be on the average number of cars in the system and the total time customers wait before being served?

5-23 Example: Model 3 Average number of cars in the system Total time customers wait before being served

5-24 Queuing Approximation This approximation is quick way to analyze a queuing situation. Now, both interarrival time and service time distributions are allowed to be general. In general, average performance measures (waiting time in queue, number in queue, etc) can be very well approximated by mean and variance of the distribution (distribution shape not very important). This is very good news for managers: all you need is mean and standard deviation, to compute average waiting time

5-25 Queue Approximation Inputs: S,, , (Alternatively: S,, , variances of interarrival and service time distributions)

5-26 Approximation Example Consider a manufacturing process (for example making plastic parts) consisting of a single stage with five machines. Processing times have a mean of 5.4 days and standard deviation of 4 days. The firm operates make-to-order. Management has collected date on customer orders, and verified that the time between orders has a mean of 1.2 days and variance of 0.72 days. What is the average time that an order waits before being worked on? Using our “Waiting Line Approximation” spreadsheet we get: L q = Expected number of orders waiting to be completed. Wq = 3.78 Expected number of days order waits. Ρ = 0.9 Expected machine utilization.

5-27 End of Chapter 5