Kamauf Custom Glass, Inc. does custom windows primarily for homes and churches. Small repair jobs can take a few hours, but larger jobs hundreds of hours. How to schedule the jobs is a continuing issue. The scheduler has decided to see what insight can be gained by examining some common sequencing rules, namely FCFS, EDD, SPT, and LPT on the criteria of Average Completion (Flow) Time, Average Lateness, and Average Number of Jobs in the System. Her sample is the six jobs on the scheduler's desk Monday morning. Assume that all jobs arrived today (day 100, which is a work day) in the order shown below. The estimated time to complete the jobs and due dates are noted below. Job Alter piece (A) Baptist Church (B) Church of Christ (C) Deacon's window (D) Entry way (special order) (E) Frank's Construction (kitchen window) (F) In what sequence would the jobs be ranked according to the following decision rules: FCFS, EDD, SPT, LPT? According to the FCFS rule, the sequence of jobs should be A, B, C, D, E, F. According to the EDD rule, the sequence of jobs should be A, C, D, F, E, B. According to the SPT rule, the sequence of jobs should be A, D, C, E, F, B. Due date (days) 130 350 140 150 195 175 Duration (days required) 5 100 17 15 20 35
Kamauf Custom Glass, Inc. does custom windows primarily for homes and churches. Small repair jobs can take a few hours, but larger jobs hundreds of hours. How to schedule the jobs is a continuing issue. The scheduler has decided to see what insight can be gained by examining some common sequencing rules, namely FCFS, EDD, SPT, and LPT on the criteria of Average Completion (Flow) Time, Average Lateness, and Average Number of Jobs in the System. Her sample is the six jobs on the scheduler's desk Monday morning. Assume that all jobs arrived today (day 100, which is a work day) in the order shown below. The estimated time to complete the jobs and due dates are noted below. Job Alter piece (A) Baptist Church (B) Church of Christ (C) Deacon's window (D) Entry way (special order) (E) Frank's Construction (kitchen window) (F) In what sequence would the jobs be ranked according to the following decision rules: FCFS, EDD, SPT, LPT? According to the FCFS rule, the sequence of jobs should be A, B, C, D, E, F. According to the EDD rule, the sequence of jobs should be A, C, D, F, E, B. According to the SPT rule, the sequence of jobs should be A, D, C, E, F, B. Due date (days) 130 350 140 150 195 175 Duration (days required) 5 100 17 15 20 35
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
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Transcribed Image Text:Kamauf Custom Glass, Inc. does custom windows primarily for homes and churches. Small repair jobs can take a few hours, but larger jobs hundreds of hours. How to schedule the jobs is a continuing issue. The scheduler
has decided to see what insight can be gained by examining some common sequencing rules, namely FCFS, EDD, SPT, and LPT on the criteria of Average Completion (Flow) Time, Average Lateness, and Average Number
of Jobs in the System. Her sample is the six jobs on the scheduler's desk Monday morning.
Assume that all jobs arrived today (day 100, which is a work day) in the order shown below. The estimated time to complete the jobs and due dates are noted below.
Job
Alter piece (A)
Baptist Church (B)
Church of Christ (C)
Deacon's window (D)
Entry way (special order) (E)
Frank's Construction (kitchen window) (F)
In what sequence would the jobs be ranked according to the following decision rules: FCFS, EDD, SPT, LPT?
According to the FCFS rule, the sequence of jobs should be A, B, C, D, E, F .
According to the EDD rule, the sequence of jobs should be A, C, D, F, E, B
According to the SPT rule, the sequence of jobs should be A, D, C, E, F, B.
According to the LPT rule, the sequence of jobs should be B, F, E, C, D, A
Construct the table of measures of effectiveness for each rule (round your responses to two decimal places).
Average
Completion (Flow)
Time
119.67
70.00
67.17
156.83
Rule
FCFS
EDD
SPT
LPT
Due
date (days)
130
350
140
150
195
175
Average Lateness
29.67
- 20.00
- 22.83
66.83
Duration (days
required)
5
100
17
15
20
35
Average number of jobs
in system
3.74
2.19
2.10
4.90
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