EBK PRINCIPLES OF OPERATIONS MANAGEMENT
10th Edition
ISBN: 8220102744059
Author: HEIZER
Publisher: PEARSON
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Chapter 3, Problem 10DQ
Summary Introduction
To determine: How the times and variances of an expected activity can be computed in a PERT network.
Introduction:
The activity times of various tasks in a PERT project network are assumed to follow a probability distribution.
For calculating the expected times and variances, the following are the parameters required:
- Optimistic time: This is the time denoted by “a”, which is the best possible or in other words, the quickest time in which an activity can be completed, assuming that everything goes as per plan.
- Pessimistic time: This is the worst case scenario, where all the conditions are adverse or unfavorable. The maximum time which may be taken in such a situation is the pessimistic time denoted by “b”.
- Most likely time: The most realistic estimate of the time, denoted by “m” in normal conditions, is another parameter which is important in the computation of expected times and variances.
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Students have asked these similar questions
Describe how expected acti vity times and variances can be computed in a PERT network.
Describe how expected activity times and variances can be computed in a PERT network.
b) – Draw the Activity-on-Node (AON) diagram using the following representation for every node:
Activity
Description
Expected
Time
ES
EF
LS
LF
Slack
C.) Complete the following table, determine the expected time of completion assuming that the project starts at week 0 (zero) and
identify the critical path for this project. Demonstrate all your calculations.
On Critical
Path?
Activity
Activity Description
ES
EF
LS
LF
Slack
Yes or No
Locate new facilities
2
Order furniture
Interview prospective staff
Hire and train staff
3
4.
Remodel facilities
Receive and set up furniture
Move in and start up
6
7
a) Complete the following table, calculate the project variance and project standard deviation. Demonstrate all your
calculations.
Chapter 3 Solutions
EBK PRINCIPLES OF OPERATIONS MANAGEMENT
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