OPERATIONS MANAGEMENT LOOSELEAF W/ CONN
14th Edition
ISBN: 9781264343898
Author: Stevenson
Publisher: MCG
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Textbook Question
Chapter 16, Problem 6P
The following table contains information concerning four jobs that are awaiting processing at a work center.
Sequence the jobs using (1) FCFS, (2) SPT, (3) EDD, and (4) CR. Assume the list is by order of arrival.
b. For each of the methods in part a, determine (1) the average job flow time, (2) the average tardiness, and (3) the average number of jobs at the work center.
c. Is one method superior to the others? Explain.
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Students have asked these similar questions
What are the advantages and disadvantages of the shortest processing time (SPT) rule?
Consider a workstation that has one maintenance mechanic to repair failed machines. We can think of the mechanic as the processor (scarce resource) and the machines awaiting repair as the jobs. Let us assume that
six machines are down, with estimated repair times given here, and that no new machines fail.
2 3 4
Job (fix
machine #)
Processing time
(hours)
Compute the flow time for each job using both the FCFS rule and the SPT rule, and compare the average flow times. Round your answers for average values to the nearest whole number.
1
NO †
4
5
6
Sequence
-Seled-
Average flow time (FCFS rule):
-Select- Y
-Select-
-Select- V
FCFS Rule
-Select- Y
7 1
Flow Time (hours)
SPT rule
Flow Time (hours)
hours
Average flow time (SPT rule):
hours
-Select- ✔ minimizes flow time and gets the most work done in the least amount of time.
Apply the four popular sequencing rules to the five jobs shown in the table below.
For each sequence determine:
The average completion time (sum of total flow time/number of jobs)
Utilisation measure (Total job work time/Sum of total flow time)
Average number of jobs in system (Sum of total flow time/Total job work time)
Average job lateness (Total late days/Number of jobs)
Job Due
Job Work (Processing)
Time
Date
(Days)
(Days)
8
6
18
15
23
Job
ABCDE
6 W ∞ NO
6
2
8
3
9
Chapter 16 Solutions
OPERATIONS MANAGEMENT LOOSELEAF W/ CONN
Ch. 16 - Why is scheduling fairly simple for repetitive...Ch. 16 - Prob. 2DRQCh. 16 - What are Gantt charts? How are they used in...Ch. 16 - Prob. 4DRQCh. 16 - Briefly describe each of these priority rules: a....Ch. 16 - Why are priority rules needed?Ch. 16 - What problems not generally found in manufacturing...Ch. 16 - Explain forward and backward schedulings and each...Ch. 16 - Prob. 9DRQCh. 16 - Prob. 10DRQ
Ch. 16 - Prob. 11DRQCh. 16 - What general trade-offs are involved in sequencing...Ch. 16 - Prob. 2TSCh. 16 - Prob. 3TSCh. 16 - One approach that can be effective in reducing the...Ch. 16 - Doctors and dentists offices frequently schedule...Ch. 16 - Prob. 3CTECh. 16 - Use the assignment method to determine the best...Ch. 16 - Rework Problem 1, treating the numbers in the...Ch. 16 - Assign trucks to delivery routes so that total...Ch. 16 - Develop an assignment plan that will minimize...Ch. 16 - Use the assignment method to obtain a plan that...Ch. 16 - The following table contains information...Ch. 16 - Using the information presented in the following...Ch. 16 - The following table shows orders to be processed...Ch. 16 - A wholesale grocery distribution center uses a...Ch. 16 - The times required to complete each of eight jobs...Ch. 16 - Prob. 11PCh. 16 - A shoe repair operation uses a two-step sequence...Ch. 16 - The following schedule was prepared by the...Ch. 16 - The production manager must determine the...Ch. 16 - A foreman has determined processing times at a...Ch. 16 - Given the information in the following table,...Ch. 16 - Given the following information on job times and...Ch. 16 - Prob. 18PCh. 16 - The following table contains order-dependent setup...Ch. 16 - The following table contains order-dependent setup...Ch. 16 - Prob. 21PCh. 16 - Given this information on planned and actual...Ch. 16 - Given the following data on inputs and outputs at...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Prob. 1CQ
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