Operations Management - CD - Access
11th Edition
ISBN: 9780133408027
Author: HEIZER
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 19P
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:
- a. What action would you take to reduce the critical path by 1 day?
- b. Assuming no other paths become critical, what action would you take to reduce the critical path one additional day?
- c. What is the total cost of the 2-day reduction?
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Students have asked these similar questions
Three activities are candidates for crashing on a projectnetwork for a large computer installation (a ll are, of course, critical).Activity details are in the following table: a) What action would you take to reduce the critical path by I day?b) Assuming no other paths become critical, what action would you take to reduce the critical path one additional day?c) What is the total cost of the 2-day reduction?
A plumber has decided to use the techniques of project management in order to plan a job. He knew all the different activities of the job, their precedence and their average durations. They are shown on the table below.
Activity
Duration (days)
Preceding activities
A
3
None
B
3
None
C
4
A
D
8
A
E
2
B and C
Required:
1. Draw a network diagram representing the sequence of activities and the dependence between them.
2. Determine how long it will take to complete the job by conducting the forward pass
3. By conducting the backward pass, identify the critical path and the non-critical path(s).
Note:
The work for this task should be produced using Word drawing facilities. The forward and backward passes should be clearly shown on the diagram. The calculations should be shown next to the network diagram.
The fo llowing is a table of activities associated with a project at Rafay lshfaq's software firm in Chicago, their durations, and what activities each must precede: a) Draw an AOA diagram of the project, including activity durations.b) Define the critical path, listing all critical activities in chronological order.c) What is the project completion time (in weeks)?d) What is the slack (in weeks) associated with any and all noncritical paths through the project?
Chapter 3 Solutions
Operations Management - CD - Access
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
- Given the activities whose sequence is describedby the following table, draw the appropriate activity-on-arrow (AOA) network diagram.a) Which activities are on the critical path?b) What is the length of the critical path?arrow_forward1. Assume that the activity time estimates (in days) for the swimming pool construction project in Problem 11 are as follows: a. What are the critical activities? b. What is the expected time to complete the project? c. Based only on the critical path, what is the estimated probability that the project can be completed in 25 or fewer days?arrow_forwardPart 1: Building a backyard swimming pool consists of nine major activities. The activities and their immediate predecessors are shown. Develop the project network. Part 2: Assume that the activity time estimates (in days) for the swimming pool construction project in Part 1 are as follows: a. What are the critical activities? b. What is the expected time to complete the project? c. Based only on the critical path, what is the estimated probability that the project can be completed in 25 or fewer days?arrow_forward
- The activities needed to replace a broken window pane are given below. Activity Duration (in mins) Preceding activities A Order glass 10 - B Collect glass 30 A C Remove broken pane 15 B,D D Buy putty 20 - E Put putty in frame 3 C F Put in new frame 2 E G Putty outside and smooth 10 F H Sweep up broken glass 5 C I Clean up 4 all (a) Construct an activity network for the project. (b) What is the minimum time to complete the replacement? (c) Show the Earliest Start Time and Latest Finish Time of each activity.arrow_forward7. For early completion of the project, emphasis on which of the following activities will be helpful? Group of answer choices An activity with the highest level of resource allocation An activity with zero slack time An activity with the highest time An activity with the highest slack timearrow_forwardGiven the activities whose sequence is described by thefol lowing table, draw the appropriate activity-on-arrow (AOA)network diagram.a) Which activities are on the critical path?b) What is the length of the critical path?arrow_forward
- GreenzTech Inc. is planning on installing a new computerised accounting system. For thisproject, they have established the following activities, precedence relationships, and timeestimates in weeks:a. Draw the network diagramb. Calculate the expected time for each activity.c. Calculate the variance of each activityd. Based on the calculation of estimated times, what is the critical path?e. What is the estimated time of the critical path?f. What is the activity variance along the critical path?g. What is the probability of completion of the project within 50 weeks or less?arrow_forwardThree recent college graduates have formed a partnership and have opened an advertising firm.Their first project consists of activities listed in the following table.a. Draw the precedence diagram.b. What is the probability that the project can be completed in 24 days or less? In 21 days or less?c. Suppose it is now the end of the seventh day and that activities A and B have been completedwhile activity D is 50 percent completed. Time estimates for the completion of activity D are5, 6, and 7. Activities C and H are ready to begin. Determine the probability of finishing theproject by day 24 and the probability of finishing by day 21.TIME IN DAYSActivityImmediatePredecessor Optimistic Most Likely PessimisticA — 5 6 7B — 8 8 11C A 6 8 11D — 9 12 15E C 5 6 9F D 5 6 7G F 2 3 7H B 4 4 5I H 5 7 8End E, G, Id. The partners have decided that shortening the project by two days would be beneficial, as longas it doesn’t cost more than about $20,000. They have estimated the daily crashing costs for…arrow_forwardThree recent college graduates have formed a partnership and have opened an advertising firm. Their first project consists of activities listed in the following table. a. Draw the precedence diagram. b. What is the probability that the project can be completed in 24 days or less? c. Suppose it is now the end of the seventh day and that activities A and B have been completed while activity D is 50 percent completed. Time estimates for the completion of activity D are 5, 6, and 7. Activities C and H are ready to begin. Determine the probability of finishing the project by day 24. TIME IN DAYS Activity Precedes Optimistic Most Likely Pessimistic A — 5 6 7 B — 8 8 11 C A 6 8 11 D - 9 12 15 E C 5 6 9 F D 5 6 7 G F 2 3 7 H B 4 4 5 I H 5 7 8 End E,G,I d. The partners have decided that shortening the…arrow_forward
- There is a running project in the company that you work for, which has the following activities: Activity Predecessors Duration A - 4 B A 4 C A 7 D B 6 E C 4 F D, E 2 Draw a network diagram for the above activities. Identify the critical path. Show the formula for calculating the EF and ES. “You must mention how did you know that this is your critical path”arrow_forwardThe estimated times and immediate predecessors for the activities in a project at Howard Umrah's retinal scanning company are given in the following table. Assume that the activity times are independent. Time (weeks) Immediate Time (weeks) Immediate Activity a m b Predecessor(s) Activity a m b Predecessor(s) A 7 10 12 — C 8 10 13 A B 5 11 16 — D 4 8 12 B This exercise contains only parts a, b, c, d, and e. Part 2 a) Based on the activity time estimates, the expected times and variance for each of the activities are (round your response to two decimal places): Activity Expected Time Variance A enter your response here enter your response herearrow_forwardThe conditions and pert times for constructing a network diagram are given below.-Creation conditions:(0-1) It is the initial activity.(1-2) and (1-3) Activities begin together.It follows activity (2-4) (1-2), activity (3-4) (1-3), and ends together.( 4-5 ) It is the last activity. a-Create the network diagram.b-Calculate the critical path and show it on the diagram.c- If the expiry time is extended by 15 days, how much will the probability of expiry increase?arrow_forward
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