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Explore the rich history and concepts of Critical Path Method (CPM) from the Egyptian pyramids to modern project management tools like Microsoft and Primavera. Learn about key figures, such as Da Vinci and Gantt, who shaped CPM development, and discover how it revolutionized project sequencing and investment decisions.
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Project Management • History and concepts • Critical Path Method (CPM) • Original CPM and Modern CPM
History • Egyptian pyramids and sphynx • Bible (Noah, Solomon, et al.) • Roman Empire • Da Vinci, Descartes • Gantt, CPM, PERT • Microsoft, Primavera • IPMA, PMI
Concepts for project • Design: development and specification of a new product or service • Project: sequence of activities or tasks • Project: investment alternatives
History of CPM 1956: James E. Kelley, Jr. (Du Pont), John W. Mauchly (EMCC), Morgan Walker (Remington) 1957: building a $10M industrial plant 1958: industrial maintenance, reducing MTTR from 125h to 74h 1959: Eastern Joint IRE-AIEE-ACM Conference 1961: Operations Research
CPM concepts Project ≈ network = ∑(events + tasks) Task Starting event Ending Event Assemble spare tire Unfasten nuts Remove spare tire Lift down car Lift up car Change tires
Network logics D D D C C C A A A B B B
Dates and slacks Data: t1 (starting earlier date) t4 (ending later date) Computed: t3 (ending earlier date) = t1 + duration t2 (starting later date) = t4 – duration Total slack = Slack = t4 – t1 – duration Free slack = t3 – t1 – duration task nameduration it1t2 j t3 t4
Original CPM (data input) 1 2 3 4 2 C1 B3 A2 D2 E4
Original CPM (solution) 10 0 22 2 35 7 44 4 28 8 C1 B3 A2 D2 E4