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Lecture7 - ISyE 1101 Foundations of Industrial and Systems...

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. . ISyE 1101: Foundations of Industrial and Systems Engineering Lecture 7: Project Management: PERT and CPM Prof. J. G. Carlsson Department of Industrial and Systems Engineering, University of Minnesota October 3/17, 2013 J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 1 / 38
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Administrivia Congratulations, you’re still alive J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 1 / 38
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Recap Project networks Activity-on-node, activity-on-arc Critical path J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 2 / 38
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Suggested reading H & L Chapter 10, “Project Management with PERT/CPM” J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 3 / 38
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PERT and CPM Large projects consist of many activities that must be coordinated efficiently PERT , “program evaluation and review technique”, and CPM , “critical path method”, are two network-based tools that help plan and display coordination of activities The two terms are more or less interchangeable and are often simply referred to as PERT/CPM in practice J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 4 / 38
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Questions of interest What is the total time required to completion, if there are no delays? What are the earliest/latest start/finish times for the activities in order to meet this completion time? What are the critical “bottleneck” activities where we need to avoid delays the most? How much delay can be tolerated for non-critical, “non-bottleneck” activities? J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 5 / 38
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Example A publisher has a contract with an author to publish a textbook. The activities associated with the production of the textbook are as follows: Activity Predecessor(s) Duration (weeks) A : Manuscript proofreading none 3 B : Sample pages preparation none 2 C : Book cover design none 4 D : Artwork preparation none 3 E : Author’s approval of edits A , B 2 F : Book formatting E 4 G : Author’s review of pages F 2 H : Author’s review of artwork D 1 I : Production of printing plates G , H 2 J : Book production and binding C , I 4 J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 6 / 38
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Project network, activity-on-node (AoN) START B (2) A (3) C (4) D (3) E (2) J (4) H (1) F (4) G (2) I (2) END J. G. Carlsson, U of MN ISyE Lecture 7: PERT & CPM October 3/17, 2013 7 / 38
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Project network, activity-on-arc (AoA) START (1) 2 A(3) 3 B(2) 5 D(3) 8 C(4) 4 E(2) 7 H(1) END (9) J(4) 6 F(2) G(2) I(2) Rules for construction: . 1 Each activity is represented by one, and only one, arc . 2 Each activity must be identified by two distinct end nodes . 3 To maintain the correct precedence relationships, the following questions must be answered as each activity is added to the network: . 1 What activities must immediately precede this activity? . 2 What activities must immediately follow this activity?
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