OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
7th Edition
ISBN: 9780077835439
Author: Roger G Schroeder, M. Johnny Rungtusanatham, Susan Meyer Goldstein
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 13, Problem 10DQ
What is the definition of the earliest and latest start times of an activity and the earliest and latest finish times of an activity?
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Farihah is a project manager for a systems development project involving a new database application
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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.
The product development group at “Griffin” Company has already worked on new computer software products that has potential to know a large market share. Via an outside source, London Management has learned that a competitor is working to bring a similar product to market. As a result, London's top management increased its pressure on the product development group. Group leaders have turned to CPM / PERT as an aid to scheduling remaining activities before new products can be brought to market. The estimated time of activity in a day is as follows
a.Create the the network if it is accelerated according to the schedule above
b.Find the cost and the duration
c.Determine the path and critical activities
The product development group at “Griffin” Company has already worked on new computer software products that has potential to know a large market share. Via an outside source, London Management has learned that a competitor is working to bring a similar product to market. As a result, London's top management increased its pressure on the product development group. Group leaders have turned to CPM / PERT as an aid to scheduling remaining activities before new products can be brought to market. The estimated time of activity in a day is as follows
Question:
Create an initial network
Find the cost and the duration
Determine the path and critical activities
Chapter 13 Solutions
OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
Ch. 13 - How, precisely, does project scheduling differ...Ch. 13 - How would you, after the fact, audit a project to...Ch. 13 - Prob. 3DQCh. 13 - Contrast and compare CPM and PERT as...Ch. 13 - Define the terms critical path, ES, and LF.Ch. 13 - What is the management significance of finding the...Ch. 13 - Prob. 7DQCh. 13 - What is meant by the need to make trade-offs...Ch. 13 - Why are a forward pass and a backward pass needed...Ch. 13 - What is the definition of the earliest and latest...
Ch. 13 - A public accounting firm requires the following...Ch. 13 - The following activities are required in starting...Ch. 13 - A construction project has the following network...Ch. 13 - A plant start-up is based on the following...Ch. 13 - An entrepreneur is starting a new business. The...Ch. 13 - Prob. 6PCh. 13 - Construction of a building is based on the...Ch. 13 - The professor from problem 6 is considering...
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- Colonial State College is considering building a new multipurpose athletic complex on campus. The complex would provide a new gymnasium for intercollegiate basketball games, expanded office space, classrooms, and intramural facilities. The following activities would have to be undertaken before construction can begin. Activity A B C D E F G H IMG_A2D52FAF8F3D-1.jpeg Activity This answer has not been graded yet. A B с (c) Develop the activity schedule for the project. D Survey building site Develop initial design Obtain board approval E F G Description H Select architect Establish budget Finalize design Obtain financing 0 Hire contractor L L | (a) Draw a project network. (Submit a file with a maximum size of 1 MB.) Choose File No file chosen Immediate Predecessor Earliest Start (b) Identify the critical path. (Enter your answers as a comma-separated list.) 4 A, B с Latest Start с D, E E F, G Time (weeks) 5 5 9 Earliest Finish 13 4 7 15 11 6 9 Latest Finish 4 Slack (d) Does it appear…arrow_forwardCalculate the ES, EF, LS, and LF times and the slack for each activity in the figure below, and identify the critical path for the project. Can the project be completed in 30 weeks? Assume that "Systems Analysis" actually finished at 8 weeks, "Design Input & Output" actually finished at 15 weeks, and "Design Database" actually finished at 19 weeks. Recalculate the expected project completion time. Which activities would you focus on to get the project back on schedule? Problem Definition 1 System Analysis Design Input & Output Design Database 4 15 Develop Input Screens Develop Output Reports 6 8 10 Develop Database 8 Test System Implement System 6 9 5 +arrow_forwardKelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table: Time (days) Activity a 3 5 3 4 1 2 7 TH 3 10 10 ABCD E F G H I K 61 525DE5 13 m Activity A 3 7 11 15 9 This exercise contains only part a. a) Based on the activity time estimates, the expected times and variance for each of the activities are: (Round your responses to two decimal places.) b 9 5 3 8 5 13 49127 13 Immediate Predecessor(s) Expected Time C B, D A, E A, E F G C H, I Variancearrow_forward
- To complete the rotor assembly for an experimental spacecraft, Gilbert has laid out nine major activities involved. These activities have been labelled A to I in the table below, which also shows their estimated completion times (in weeks) and their immediate predecessors. EVENTS AND ACTIVITIES FOR ROTOR ASSEMBLY ACTIVITIES TIMES (IN WEEKS) PRECEDING EVENT A M B A 1 2 3 - B 2 3 4 A C 4 5 6 A D 8 9 10 A E 2 5 8 B F 4 5 6 B, C G 1 2 3 F, D H 1 3 5 E, F I 2 4 6 H, G Key: A is optimist time, M is the most likely time and B is the pessimistic time. a) Calculate the expected time for each activity b) Draw a Gantt Chart from the same information above c) State the critical path and the maximum number of weeks the project will take to be completed. d) Discuss the pros and cons of using the Gantt chart as a planning and scheduling tool?arrow_forwardA large Southeast city is requesting federal funding for a park-and-ride project. One of the requirements in the request application is a network plan for the design phase of the project. Sophie Kim, the chief engineer, wants you to develop a project network plan to meet this requirement. She has gathered the activity time estimates and their dependencies shown here. Description Survey Soils report C Traffic design D Lot layout E Approve design Illumination G Drainage H Landscape I Signage J Bid proposal ID A B The project is expected to take The critical path is: Early start for Activity E is: Late finish for Activity F is: Slack for Activity C is: Predecessor None A A A B, C, D E E E E F, G, H, I Time (days) 13 22 21 a 9 74 20 20 22 17 15 12 days. day(s).arrow_forwardA project consist of 5 activities A,B,C,D,E with ES, EF, LS and LF of A (0, 6, 9, 15); B (0, 7, 0, 7); C (6, 13, 15, 22); D (7, 13, 7, 13); E (13, 22, 13, 22). Normal Time (in month), Crash time (in month), Normal cost (in million Rp), Crash cost (in million Rp) from each activity are A (6, 4, 20, 24); B (7, 5, 30, 35); C (7, 6, 10, 13); D (6, 4, 20, 26); E (9, 8, 88, 90) a. What activities are in the critical path? How long is the project duration? b. If we want to crash the project for 2 months, what activities need to be crashed? How much additional cost required?arrow_forward
- Dayagsky Construction Firm, Inc. will soon begin to work on a building for US tea that was initially started by another firm that has gone out of business. The construction firm’s schedule of activities and related expected completion time for US tea project are presented in the following time table: Activity Code Activity Description Estimated Time (in weeks) A - B Obtain on-site work permits 2 B – E Repair damages done by vandals 8 B – C Inspect construction materials left on site 1 C – E Order and receive construction materials 2 C – D Apply for waiver to…arrow_forwardAn activity originally estimated to cost $100,000 and require 30 weeks to complete. Now the activity is on week 10 and $35,000 were spent and is 40% completed. What is the Earned Value for this activity?arrow_forwardSlack guns for each of the activitiesarrow_forward
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