OM6     ONLINE-LMS INTEGRATED ACCESS
OM6 ONLINE-LMS INTEGRATED ACCESS
6th Edition
ISBN: 9781337118323
Author: Collier
Publisher: CENGAGE L
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Chapter 14, Problem 10PA

A

Summary Introduction

Interpretation: The order in which the jobs have arrived, the average flow time, tardiness and lateness are to be calculated and compared.

Concept Introduction:The process of planning the ordering of the activities involves based on the elements such as, priority, set up time and such other is referred to as sequencing.

A

Expert Solution
Check Mark

Answer to Problem 10PA

After necessary calculations, it can be seen that the average flow time is 25, lateness is 9.5, and tardiness is 11.25.

Explanation of Solution

Under the given order rule:

    JobProcessing TimeFlow TimeDue DateLatenessTardiness
    17721-140
    2310733
    3515877
    421751212
    56231766
    6932161616
    714463888
    8450123838
    Average25.009.5011.25

Average Flow Time will be;

  =7+10+15+17+23+32+46+508=2008=25.00

The average lateness will be;

  =14+3+7+12+6+16+8+388=768=9.50

The average tardiness will be;

  =0+3+7+12+6+16+8+388=908=11.25

B

Summary Introduction

Interpretation: the shortest processing time is to be calculated.

Concept Introduction: The process of planning the ordering of the activities involves based on the elements such as, priority, set up time and such other is referred to as sequencing.

The process of scheduling involves assignment of the proposed jobs, equipment or people with the start and end times.

B

Expert Solution
Check Mark

Explanation of Solution

    Job42835167
    JobProcessing TimeFlow TimeDue DateLatenessTardiness
    4225-30
    2357-20
    84912-30
    3514866
    56201733
    17272166
    6936162020
    71450381212
    Average20.384.885.88

C

Summary Introduction

Interpretation: The earliest due date is to be derived.

Concept Introduction: The process of planning the ordering of the activities involves based on the elements such as, priority, set up time and such other is referred to as sequencing.

C

Expert Solution
Check Mark

Explanation of Solution

    Job42386517
    JobProcessing TimeFlow TimeDue DateLatenessTardiness
    4225-30
    2357-20
    3510822
    84141222
    69231677
    5629171212
    1736211515
    71450381212
    Average21.135.636.25

Below is the required comparison of the derived solutions:

    Average Flow TimeAverage LatenessAverage Tardiness
    FCFS25.009.5011.25
    SPT20.384.885.88
    EDD21.135.636.25

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What are the advantages and disadvantages of the shortest processing time (SPT) rule?
What are the benefits and drawbacks of the shortest processing time rule (SPT)?
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
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