EBK OPERATIONS MANAGEMENT
11th Edition
ISBN: 8220103630726
Author: RENDER
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 26P
The Tesla 6 is a new custom-designed sports car. An analysis of the task of building the Tesla 6 reveals the following list of relevant activities, their immediate predecessors, and their duration:2
2 Source: Adapted from James A. D. Stoner, Management, 6th ed. (Upper Saddle River, NJ: Pearson 1995).
- a. Draw a network diagram for the project.
- b. Mark the critical path and state its length.
- c. If the Tesla 6 had to be completed 2 days earlier, would it help to:
- i) Buy preassembled transmissions and drivetrains?
- ii) Install robots to halve engine-building lime?
- iii) Speed delivery of special accessories by 3 days?
- d. How might resources be borrowed from activities on the noncritical path to speed activities on the critical path?
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Problem 1
The following data represent the plan of a project in Magic Corporation:
Times (weeks)
Activity
A
B
C
D
DEF
Predecessor
G
H
1
J
A
A
A
B, C
D
a
4
2
2
1
3
4
1
1
3
1
m
5
4
4545300
E, F
G
G
H, I
a. Draw the network diagram and find the critical path.
b. Estimate the expected completion time of the project.
c. Calculate the probability that the job will take more than 30 weeks to complete.
d. Calculate the probability that the job will take less than 26 weeks.
3
8
b
12
12
6
9
5
6
4
2
5
9
11
3
Сл
1. Draw the network diagram
2. List the network paths
3. Determine the critical path(s)
4. Determine the float for each activity
Activity
Start
A
B
C
D
E
F
G
H
I
J
K
L
Finish
Duration
(Days)
0
8
5
6
8
9
3
7
8
9
5
2
3
0
Dependency
Start
A
B, H
C
D, F
C, I
Start
G
H
1
J
J
Float
(2) Consider the following project:
Activity
A
B
D
E
F
G
H
I
Immediate Optimistic Most Probable
Predecessor (days)
(days)
A
A
B, C
B
A
D
G
E, H, F
I
4
2
1
2
1
I
1
1
2
6
4
2
3
2
2
2
1
Pessimistic
(days)
Draw the Network diagram.
• Calculate expected time and variance for each activity.
Find the critical path.
• Calculate the total project completion time.
• Find project variance.
3
8
6
3
4
3
3
3
1
Chapter 3 Solutions
EBK OPERATIONS MANAGEMENT
Ch. 3 - Give an example of a situation in which project...Ch. 3 - Explain the purpose of project organization.Ch. 3 - What are the three phases involved in the...Ch. 3 - What are some of the questions that can be...Ch. 3 - Define work breakdown structure. How is it used?Ch. 3 - What is the use of Gantt charts in project...Ch. 3 - What is the difference between an...Ch. 3 - What is the significance of the critical path?Ch. 3 - What would a project manager have to do to crash...Ch. 3 - Describe how expected activity times and variances...
Ch. 3 - Define earliest start, earliest Finish, latest...Ch. 3 - Students are sometimes confused by the concept of...Ch. 3 - What are dummy activities? Why are they used in...Ch. 3 - What are the three time estimates used with PERT?Ch. 3 - Would a project manager ever consider crashing a...Ch. 3 - How is the variance of the total project computed...Ch. 3 - Describe the meaning of slack, and discuss how it...Ch. 3 - How can we determine the probability that a...Ch. 3 - Name some of the widely used project management...Ch. 3 - The work breakdown structure (WBS) for building a...Ch. 3 - 3.2 Robert Day has decided to run for a seat as...Ch. 3 - Draw the activity-on-node (AON) project network...Ch. 3 - Given the activities whose sequence is described...Ch. 3 - 3.5 Using AOA, diagram the network described below...Ch. 3 - Stephen Hall is developing a program in supply...Ch. 3 - Task time estimates for the modification of an...Ch. 3 - 3.8 The City Commission of Nashville has decided...Ch. 3 - Refer to the table in Problem 3.8. a. Draw the AON...Ch. 3 - The activities needed to build a prototype laser...Ch. 3 - Dave Fletcher (see Problem 3.10) was able to...Ch. 3 - The activities described by the following table...Ch. 3 - A renovation of the gift shop at Orlando Amway...Ch. 3 - Kelle Carpet and Trim installs carpet in...Ch. 3 - The following is a table of activities associated...Ch. 3 - Assume that the activities in Problem 3.15 have...Ch. 3 - Bill Fennema, president of Fennema Hospitality,...Ch. 3 - What is the minimum cost of crashing the following...Ch. 3 - Three activities are candidates for crashing on a...Ch. 3 - Development of Version 2.0 of a particular...Ch. 3 - The estimated times and immediate predecessors for...Ch. 3 - Rich Cole Control Devices, Inc., produces...Ch. 3 - Four Squares Productions, a firm hired to...Ch. 3 - Using PERT, Adam Munson was able to determine that...Ch. 3 - Clark Products makes pizza ovens for commercial...Ch. 3 - The Tesla 6 is a new custom-designed sports car....Ch. 3 - TABLE 3.6 Southwestern University Project 1....Ch. 3 - TABLE 3.6 Southwestern University Project 2 What...Ch. 3 - TABLE 3.6 Southwestern University Project 3. If it...Ch. 3 - Project Management at Arnold Palmer Hospital Video...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...
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