Difference between PERT and CPM and their application in house construction Agenda Introduction Techniques – PERT & CPM Applications Differences Benefits Conclusion Introduction Network Analysis Technique of operations research Planning, scheduling and controlling Large and complex projects. Objective Schedule required activities efficiently Complete it on or before specific time limit Minimum cost. Network Analysis - Techniques PERT – Program Evaluation and review Technique CPM – Critical Path Method PERT PERT– Program Evaluation & Review Technique Developed in 1956-58 by a research team Help in planning & scheduling of the US navy’s project which involved thousands of activities. Technique proved to be useful for all projects which have an element of uncertainty in the estimation of duration. CPM CPM – Critical Path Method Developed by EI DuPont company along with Remington Rand corporation. Aim was to provide a technique for control of the maintenance of the co’s plants. Use extended to cost & resource allocation. Applications of network analysis Construction Software development Research projects Product development Engineering Application in house construction Activity Description Acquiring land Foundation Construction of basic structure Wood works Concrete Plumbing & Electrical work Flooring & designing Finishing interior & exterior Duration 4 6 2 5 2 7 4 1 Construction Project E.g. 1 A B C D E F G H Solution E= 17 L= 17 E= 0 L= 0 1 A E= 4 L= 4 2 B E= 10 L= 10 D C 5 F E= 24 L= 24 3 4 E= 12 E L= 12 7 6 E= 14 L= 14 H 8 E= 25 L= 25 G Critical Path :1- 2- 3- 4- 5- 7- 8 Non critical path : 1- 2- 3- 4- 6- 7- 8 6 weeks Float 25 weeks 19 weeks Difference b/w PERT & CPM PERT Uses 3 estimates to form weighted avg of expected completion time. Tool for planning & control of time. CPM Uses 1 estimate to form weighted avg of expected completion time. Tool for planning & control of time & cost. Contd… Used for projects Used for projects involving activities of non-repetitive nature. involving activities of repetitive nature. Benefits of using PERT/CPM Helps in clarity of thoughts & actions Forecasting future – problems, difficulties. Helps in timely allocation of resources Helps in division of responsibilities. Helps in accurate estimation of cost and time for future projects. Conclusion Thus these techniques help in completion of projects with no over-runs of time and cost. Permits utilization of networks for similar projects which results in faster planning.