CPM+250411

CPM+250411 - Scheduling Techniques: CPM Method Readers...

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Scheduling Techniques: CPM Method
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Reader’s Guide Title slide: Projects are often moving targets, but the team still needs to work productively towards completing the project. Project schedules are an essential tool to enable productive work and collaboration. Slides 3 and 4: Coordinating teams of professionals with many specialties (disciplines) is not unique to construction. Consider what enables a symphony orchestra and a football team (links to examples are in the Materials section on coursework) to give a successful performance. A common communication language and a shared plan are critical to enable successful performances. A schedule becomes the playbook or the score for a team of architects, engineers, and constructors (AEC) for a building project. Slide 5: John Fondahl, faculty member in CEE at Stanford from the mid 50s to the late 80s. He pioneered the development of the Critical Path Method (CPM) to represent project schedules in the construction (AEC) industry. Slide 6: What a CPM schedule looks like. Slides 7-9: Example of developing a CPM schedule. Slides 10-14: The key terms and mechanics of CPM. Slides 15-34: Example of developing a CPM schedule. Slides 35 and 36: Conceptually determining float of activities. Slides 37-45: Additional topics, including organization of schedule (activity) information and other considerations in making a schedule.
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CPM can help you figure out: • how long a project will take to complete • which activities are "critical," meaning that they have to be done on time or else the whole project will take longer Critical Path Method (CPM)
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CPM Modeling Example: FS vs. SS/FF Relationships You are responsible to schedule the finishing subcontractors for a tenant improvement project. The project calls for the installation of 2,500 m2 of carpet, the painting of 600 m2 of walls and the set-up of 175 m of partition walls. The production rates for a normal crew for these operations are as follows: – 250 m2 of carpet per day – 40 m2 of painted walls per day – 50 m of partition walls per day The carpet subcontractor can start installing the carpet after one third of the painting has been completed, and painting should finish at least two days before carpeting finishes. The partition walls can start no earlier than one day after half the carpet has been placed. Partition walls can also not be completed until one day after the last piece of carpet has been placed.
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Example with FS Relationships Only Act N TF D EF LF ES LS Legend: FF 5 3 5 0 0 5 5 5 10 11 14 17 14 12 7 10 5 5 15 15 3 10 13 15 12 2 15 17 17 15 1 17 18 18 17 Paint Walls (33.3%) Place Carpet (50%) Install Part. Walls (75%) Paint Walls (66.7%) Place Carpet (30%) Place Carpet (20%) Install Part. Walls (25%) 1 0 0 0 0 0 0 0 0 2 2 2 0 3 3
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Example with SS, FF Relationships Paint Walls Place Carpet Install Partition Walls 15 4 5 2 6 1 10 0 0 15 15 5 17 11 18 18 14 17 7 0 0 2/0 0 3/0 0
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Place Wall Forms 5 8 Pour Wall Concrete 6 4 Grading 5 8 Place Footing
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CPM+250411 - Scheduling Techniques: CPM Method Readers...

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