Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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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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Students have asked these similar questions
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
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- Draw a network diagram for the project. Find the minimum project completion time. Identify the critical activities and critical path.arrow_forwardPlease explain how to solve this chart in terms of engineering project managment How can I draw the network diagrams?How can I list the network paths?How can I determine the critical paths? How can I determine the float for each activity?arrow_forwardUse Excel to develop the Network Diagram for the Sample Project (assume project starts on September 1, 2021)arrow_forward
- Section A - Please answer # 2 - Determine the project length without crashingarrow_forwardTable 7.8 contains data for the installation of new equipment in a manufacturing process at Excello Corporation. Your company is responsible for the installation project. Indirect costs are $15,000 per week, and a penalty cost of $9,000 per week will be incurred by your company for every week the project is delayed beyond week 9.a. What is the shortest time duration for this project regardless of cost?b. What is the minimum total cost associated with completing the project in 9 weeks?c. What is the total time of the minimum-cost schedule?arrow_forwardMemorial College is considering building a new multipurpose athletic complex on campus. The following activities would have to be undertaken before construction can begin. Activity Description ImmediatePredecessor Time(weeks) A Survey building site 7 B Develop initial design 10 C Obtain board approval A, B 13 D Select architect C 3 E Establish budget C 5 F Finalize design D, E 14 G Obtain financing E 11 H Hire contractor F, G 9 (a) Draw a project network. (b) Identify the critical path. (c) Develop the activity schedule for the project. Activity EarliestStart LatestStart EarliestFinish LatestFinish Slack A B C D E F G H (d) What is the expected completion time for the project? The expected completion time is weeksarrow_forward
- Activity b Immediate a m Predecessor (days) A 1 3 B 0.5 1 1.5 A C 4 6 8 A D 5 7 B E 1 3 F 12 D G 7 10 13 С, F H 1 3 C I 2 4 H J 1 2 3 E, G, I K 0.5 1 1.5 H 1. Compute the most probable or mean time, t. Indicate your answers in the table above. 2. Construct the Network Diagram. Determine the Early Start and Early Finish of each of the activities. Determine the total duration of the project. Total Duration of the Project =arrow_forwardhow would It look in a network diagram?arrow_forwardPERT-CPM 1. Consider a project involving the following activities and precedence relationship. The cost of each activity is listed. The following activity time estimates have been provided for a preparation involving an MIS project. a. Draw the AON and AOA Diagram. b. Perform a Program Evaluation and Review Technique (PERT) to determine the expected total duration of the project. [Note: Use the diagramming convention agreed in class and tabulate the results for each activity's ES, EF, LS, LF, slack time and indication if it's in the critical path Note: Expected (Ave Time) = (0ptimistic Time + 4*Most Likely Time + PessimisticTime) / 6 = ( OT + 4MLT + PT ) / 6 c. If the project exceeds 11 weeks, there is an additional miscellaneous costs around Php 30,000. Will the company opt to speed up the project? Activity Predecessors Optimistic Most Pessimistic Crash Normal Crashed Likely Time Cost Cost A 2 4 6. 2 11,000 6,000 3,000 7,000 4,000 13,000 9,000 4,000 5,000 3,000 3 17.000 В 1 3 5 1…arrow_forward
- 9.2. Construct a Gantt chart for the project described by the following set of activities, and indicate the project completion time and the available slack for each activity:Activity Activity Predecessor Time (Weeks)1 — 32 — 73 1 24 2 55 2 66 4 17 5 4 Present a Gantt Chart that shows the timeline from start to end. This calls for drawing an A-O-N network diagram using the information given in the Table. Present a Table of Activity versus Slack (wks) and state which specific activities are on the Critical path.arrow_forwardIdentify and explain the critical activities in the network and consequently, calculate the critical path of the project below.arrow_forward19 A network consists of the following list. Times are given in weeks. Activity Preceding Optimistic Probable Pessimistic A -- 5 11 14 B - 3 3 9 C -- 6 10 14 D A, B 3 5 7 E B 4 6 11 F C 6 8 13 G D, E 2 4 6 H F 3 3 9 a. Draw the network diagram. b. Calculate the expected duration and variance of each activity. c. Calculate the expected duration and variance of the critical path. d. Calculate the probability that the project will be completed in less than 28 weeks.arrow_forward
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