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Navy for polaris missile 1958 consider precedence

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Navy, for Polaris missile (1958) Consider precedence relationships and interdependencies Each uses a different estimate of activity times PERT and CPM PERT and CPM
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63-35 Is the project on schedule, ahead of schedule, or behind schedule? Is the project over or under cost budget? Are there enough resources available to finish the project on time? If the project must be finished in less than the scheduled amount of time, what is the way to accomplish this at least cost? Questions Which May Be Addressed by Questions Which May Be Addressed by PERT & CPM PERT & CPM
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63-36 The Six Steps Common to PERT & CPM The Six Steps Common to PERT & CPM Define the project and prepare the work breakdown structure, Develop relationships among the activities. (Decide which activities must precede and which must follow others.) Draw the network connecting all of the activities Assign time and/or cost estimates to each activity Compute the longest time path through the network. This is called the critical path Use the network to help plan, schedule, monitor, and control the project
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63-37 A Comparison of AON and AOA Network Conventions A Comparison of AON and AOA Network Conventions
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63-38 Milwaukee General Hospital’s Activities and Predecessors Milwaukee General Hospital’s Activities and Predecessors Activity Description Immediate Predecessors A Build internal components - B Modify roof and floor - C Construct collection stack A D Pour concrete and install frame A, B E Build high-temperature burner C F Install pollution control system C G Install air pollution device D, E H Inspect and test F, G
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63-39 AON Network for Milwaukee General AON Network for Milwaukee General Hospital Hospital Start A B C D F F G H Arrows show precedence relationships
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63-40 1 3 2 4 5 6 7 H Inspect/Test G Install pollution control devi ce D Pour concrete/ Install frame B Modif y roof/floor C Construct stack F In stall contr ols E B u i l d b u r n e r AOA Network (With Dummy Activities) for AOA Network (With Dummy Activities) for Milwaukee General Milwaukee General A Build inte rnal compone nts Dummy Activity
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63-41 Provides activity information Earliest ( ES ) & latest ( LS ) start Earliest ( EF ) & latest ( LF ) finish Slack ( S ): Allowable delay Identifies critical path Longest path in network Shortest time project can be completed Any delay on critical path activities delays project Critical path activities have 0 slack Critical Path Analysis Critical Path Analysis
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63-42 Begin at starting event and work forward ES = 0 for starting activities ES is earliest start EF = ES + Activity time EF is earliest finish ES = Maximum EF of all predecessors for non- starting activities Earliest Start and Finish Steps Earliest Start and Finish Steps
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63-43 Begin at ending event and work backward LF = Maximum EF for ending activities LF is latest finish; EF is earliest finish LS = LF - Activity time LS is latest start LF = Minimum LS of all successors for non- ending activities Latest Start and Finish Steps Latest Start and Finish Steps
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63-44 Latest Start and Finish Steps
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