Operations Management
13th Edition
ISBN: 9781259667473
Author: William J Stevenson
Publisher: McGraw-Hill Education
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Chapter 17, Problem 14P
The project manager of a task force planning the construction of a domed stadium had hoped to be able to complete construction prior to the start of the next college football season. After reviewing construction time estimates, it now appears that a certain amount of crashing will be needed to ensure project completion before the season opener. Given the following time and cost estimates, determine a minimum-cost crashing
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The project manager of a task force planning the construction of a domed stadium had hopedto be able to complete construction prior to the start of the next college football season. Afterreviewing construction time estimates, it now appears that a certain amount of crashing will beneeded to ensure project completion before the season opener. Given the following time and costestimates, determine a minimum-cost crashing schedule that will shave five weeks off the projectlength. Note: No activity can be crashed more than two weeks.CRASHING COSTS ($000)Activity Immediate Predecessor Normal Time (weeks) First Week Second WeekA — 12 $15 $20B A 14 10 10C — 10 5 5D C 17 20 21E C 18 16 18F C 12 12 15G D 15 24 24H E 8 — —I F 7 30 —J I 12 25 25K B 9 10 10M G 3 — —N H 11 40 —P H, J 8 20 20End K, M, N, P
Contract requirements state that a project must be completed within 180 working days, or it will incur penalties for late completion. Analysis of the activity network reveals an estimated project time of 145 working days with a project variance of 400. What is the probability that the project will be completed before the late-payment deadline?
Swimming Pool Installation:
You are the project manager working for Mack's Pool Co. Your project consists of installing a new swimming pool at the local country club before Memorial Day weekend (pool opening weekend). You would like to find the minimum cost schedule for your project. There is a $9,000 per week penalty for each week the project is delayed beyond week 9. In addition, your project team determined that indirect costs are $15,000 per week.
ACTIVITY
Immediate Predecessor (s)
NORMAL TIME (NT)
CRASH TIME (CT)
Normal Cost (NC)
Crash Cost (CC)
A
--
2
1
7,000
10,000
B
--
2
2
3,000
3,000
C
A
3
1
12,000
40,000
D
B
3
2
12,000
28,000
E
C
1
1
8,000
8,000
F
D, E
5
3
5,000
15,000
G
E
3
2
9,000
18,000
Before crashing, the project duration is _________ week(s).
The total cost of the project if we do nothing is $ __________ (round to the nearest dollar).
The minimum cost…
Chapter 17 Solutions
Operations Management
Ch. 17 - A project manager may need two skill setsthose of...Ch. 17 - Explain the term project champion and list some...Ch. 17 - List the steps in risk management.Ch. 17 - Give some examples of ethical issues that may...Ch. 17 - What are the key advantages of using project...Ch. 17 - What is a work breakdown structure, and how is it...Ch. 17 - Identify the term being described for each of the...Ch. 17 - List the main advantages of PERT. List the main...Ch. 17 - Why might a probabilistic estimate of a projects...Ch. 17 - Define each of these terms, and indicate how each...
Ch. 17 - Why might a person wish to be involved with a...Ch. 17 - Prob. 12DRQCh. 17 - What are some aspects of the project managers job...Ch. 17 - What is the main benefit of a project organization...Ch. 17 - What trade-offs are associated with time and cost...Ch. 17 - Who needs to be involved in assessing the cost of...Ch. 17 - Prob. 3TSCh. 17 - Project management techniques have been used...Ch. 17 - Give three examples of unethical conduct involving...Ch. 17 - For each of the following network diagrams,...Ch. 17 - Chris received new word processing software for...Ch. 17 - Prepare a Gantt chart for each of the following in...Ch. 17 - a. Develop a list of activities and their...Ch. 17 - For each of the problems listed, determine the...Ch. 17 - PRINTED BY: 92248ddb24ccbc6@placeholder.10274.edu....Ch. 17 - Three recent college graduates have formed a...Ch. 17 - The new director of special events at a large...Ch. 17 - PRINTED BY: 92248ddb24ccbc6@placeholder.10274.edu....Ch. 17 - The project described in the following table is...Ch. 17 - The following precedence diagram reflects three...Ch. 17 - A project manager has compiled a list of major...Ch. 17 - Here is a list of activity times for a project as...Ch. 17 - The project manager of a task force planning the...Ch. 17 - PRINTED BY: 92248ddb24ccbc6@placeholder.10274.edu....Ch. 17 - Chucks Custom Boats (CCB) builds luxury yachts to...Ch. 17 - Prob. 17PCh. 17 - Create a risk matrix in the style of Figure 17.13...Ch. 17 - Create a risk matrix for this project: Explain...Ch. 17 - CASE: The Case of the Mexican crazy quilt 1. The...Ch. 17 - CASE: The Case of the Mexican crazy quilt 2. The...Ch. 17 - CASE: The Case of the Mexican crazy quilt 3. The...Ch. 17 - CASE: The Case of the Mexican crazy quilt 4. The...Ch. 17 - CASE: The Case of the Mexican crazy quilt 5. The...Ch. 17 - B. Smitty Smith is a project manager for a large...
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- Farihah is a project manager for a systems development project involving a new database application for her organization’s human resources department. Despite Farihah’s best efforts at estimating the time requirements for the project, the team has missed the deadline for completing the Analysis Phase and producing the System Proposal. Farihah had estimated during her 6-week Planning Phase that Analysis would require 2 months, but the team finished the System Proposal 2 weeks behind their planned target date. Based on her discussions with the team members, Farihah believes that the system is more complex than she originally thought. Should Farihah adjust her timeline, or can she try to make up for the lost two weeks? Farihah needs your advice.arrow_forwardShrink the occurrence time of the following project and find: a) The critical path and the expected project completion time. b) Find the optimal duration and optimal cost. Normal Crash Activities Time Cost Time Cost 1-2 100 1-3 150 2-4 50 2-5 100 3-4 100 4-5 80. 843324 722213 200 230 90 150 200 100arrow_forwardDevelopment of Version 2.0 of a particular accounting software product is being considered by Jose Noguera's technology firm in Baton Rouge. The activities necessary for the completion of this project are listed in the following table: Activity Normal Time (weeks) Crash Time (weeks) Normal Cost Total Cost with Crashing Immediate Predecessor(s) A 4 3 $2,100 $2,800 — B 2 1 $2,300 $3,100 — C 3 3 $600 $600 — D 8 4 $2,400 $2,680 A E 6 3 $1,000 $1,450 B F 3 2 $3,200 $4,600 C G 4 2 $1,400 $2,000 D, E Part 2 a) Based on the given information regarding the activities for the project, the project length = enter your response here weeks.arrow_forward
- Three activities are candidates for crashing on a project network for a large computer installation (all are, of course, critical). Activity details are in the following table: Total Cost Normal Time Crash Time Normal with Immediate Activity (days) (days) Crashing $6,500 $3,300 $6,000 Cost Predecessor(s) 7 $6,000 B $1,400 $4,000 A 11 a) Activity that should be crashed first to reduce the project duration by 1 day is b) Activity that should be crashed next to reduce the project duration by one additional day is c) Total cost of crashing the project by 2 days = $. (Enter your response as an integer.)arrow_forwardA project has the activity duration and cost information indicated in the table where all times are in weeks. What is the total cost for completing this project in 50 days? Activity Predecessor Normal Time Normal Cost Crash Time Crash Cost A -- 8 $12,000 5 $21,000 B A 12 $20,000 9 $30,000 C A 15 $24,000 10 $60,000 D B 3 $10,000 2 $15,000 E C 9 $17,000 6 $34,000 F E 7 $5,000 6 $6,000 G D 8 $14,000 6 $20,000 H A 12 $22,000 10 $30,000 I H 6 $50,000 5 $55,000 J F, G, I 11 $33,000 9 $50,000arrow_forwardConsider the project described in the table below: Activity Duration A B C D E F G H 9 4 8 8 5 7 4 6 OEST-9 and LCT = 15 OEST=9 and LCT = 13 Immediate Predecessor What is the earliest start time (EST) and latest completion time (LCT) of activity B? OEST=9 and LCT = 20 OEST-9 and LCT-17 - A A A B B,C C,D E,F,Garrow_forward
- Activities, preceding activities, normal and crashed completion times of each of the activities and crashed costs of activities per week of a project are given in the following table. Activity Preceding Activity Normal Crashed Completion time (week) Crashed Cost Completion Time (week) 7 per week A 7 B $500 C 4 3 $700 $600 A A, C В, D D, E D 7 E F 10 9. $800 9 8 $400 i. Draw the network diagram linking all the activities in a way that it shows if there exist any preceding activity/activities before starting each of the mentioned activities in the above table. ii. Find the earliest start time, the earliest finish time, the latest start time and the latest finish time of each of the activities in the drawn diagram of the project and hence the completion time of the project and the critical path.arrow_forwardDevelopment of Version 2.0 of a particular accounting software product is being considered by Jose Noguera's technology firm in Baton Rouge. The activities necessary for the completion of this project are listed in the following table: Activity Normal Time (weeks) Crash Time (weeks) Normal Cost Total Cost with Crashing Immediate Predecessor(s) A 4 3 $2,100 $2,750 — B 2 1 $2,300 $3,100 — C 3 3 $600 $600 — D 8 4 $2,400 $2,720 A E 6 3 $1,000 $1,450 B F 3 2 $3,000 $4,400 C G 4 2 $1,500 $2,000 D, E a) Based on the given information regarding the activities for the project, the project length = enter your response here weeks. b) The total cost required for completing this project on normal time = $enter your response here. c) For…arrow_forwardCrashed Completion time (week) Crashed Cost per Preceding Activity Normal Completion Time (week) Activity week A 7 5 $600 $700 $400 $800 12 10 A 8 2 D 9 7 E C, D 5 4 $300 F E 9 8 $500 G D, F 10 10 Find the minimum possible completion time of the project by considering the crashed completion times and the minimal total cost of that crashing the project. Highlight the critical and non-critical activities of the finally completed project by taking into account the crashed times of activities.arrow_forward
- Some projects do not continue to completion due to various reasons. Discuss any five reasons why a project could be terminated before the completion date.arrow_forwardHow can we determine the probability that a project will be completed by a certain date? What assumptions are made in this computation?arrow_forwardOffice Automation, has developed a proposal for introducing a new computerized office system that will improve word processing and interoffice communications for a particular company. Contained in the proposal is a list of activities that must be ac- accomplished to complete the new office-system project. Information about the activities is shown below where times are in weeks and costs are in thousands of dollars. NOTE: The crashing cost given in the last (seventh) column of the table below is the total cost to finish an activity by its minimum time given in the fifth column.arrow_forward
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