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PERT/CPM. By Bhupendra Ratha, Lecturer S. L. I. Sc., D.A.V.V., Indore Email Id: bhu261@gmail.com. PERT. Project Evaluation and Review Technique (PERT) U S Navy (1958) for the POLARIS missile program Multiple task time estimates (probabilistic nature)

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pert cpm

PERT/CPM

By

Bhupendra Ratha, Lecturer

S. L. I. Sc.,

D.A.V.V., Indore

Email Id: bhu261@gmail.com

slide2
PERT
  • Project Evaluation and Review Technique (PERT)
    • U S Navy (1958) for the POLARIS missile program
    • Multiple task time estimates (probabilistic nature)
    • Activity-on-arrow network construction
    • Non-repetitive jobs (R & D work)
need of pert cpm
Need of PERT/CPM
  • Prediction of deliverables
  • Planning resource requirements
  • Controlling resource allocation
  • Internal program review
  • External program review
  • Performance evaluation
  • Uniform wide acceptance
use of pert
Use of PERT
  • In construction activities
  • Transportation activities
  • In oil refineries
  • Computer system-
  • For manufacturing electric generator machines
  • Medical and surgical sector
  • Library activities
importance of pert system
Importance of PERT system
  • Reduction in cost
  • Saving of time
  • Determination of activities
  • Elimination of risk in complex activities –
  • Flexibility
  • Evaluation of alternatives-
  • Useful in effective control-
  • Useful in decision making
  • Useful is research work
history of cpm
History of CPM
  • Critical Path Method (CPM)
    • E I Du Pont de Nemours & Co. (1957) for construction of new chemical plant and maintenance shut-down
    • Deterministic task times
    • Activity-on-node network construction
    • Repetitive nature of jobs
cpm calculation
CPM calculation
  • Path
    • A connected sequence of activities leading from the starting event to the ending event
  • Critical Path
    • The longest path (time); determines the project duration
  • Critical Activities
    • All of the activities that make up the critical path
procedure of pert cpm
Procedure of PERT/CPM
  • Develop a list of activities that make up project.
  • Estimate the completion time for each activity.
  • Draw a project network and t
benefits of cpm pert
Benefits of CPM/PERT
  • Useful at many stages of project management
  • Mathematically simple
  • Give critical path and slack time
  • Provide project documentation
  • Useful in monitoring costs
limitations to cpm pert
Limitations to CPM/PERT
  • Clearly defined, independent and stable activities
  • Specified precedence relationships
  • Over emphasis on critical paths
  • Deterministic CPM model
  • Activity time estimates are subjective and depend on judgment
  • PERT assumes a beta distribution for these time estimates, but the actual distribution may be different
  • PERT consistently underestimates the expected project completion time due to alternate paths becoming critical