EDP Notes

It was developed by a Navy sponsored Research Team composed of D.G. Malcolm, J.R.
Rose boom, C.E. Clark and W. Fazar in 1958. PERT is a network technique of scheduling and
controlling the project where activity times cannot be precisely estimated. Its primary purpose is to
facilitate the planning and controlling of a project in order to achieve lower costs, reduce project
time and more effective co-ordination and utilization of human and physical resources. PERT deals
with the problems of uncertain activity times. Generally 3 time estimates are used.
They are:
1) Optimistic Time (to): It is the shortest possible time in which an activity can be
completed. The probability of happening this is 1 in 100.
2) Pessimistic Time (tp): It is the maximum possible time in which an activity can be
completed-e, if everything goes wrong. The happening this also might be 1 in 100.
3) Most Likely Time (tm): This lies in between ‘to’ and ‘tp’. It is the estimated time in the
normal conditions that an activity would require.
The expected time of each activity would be calculated by the following formula:
te = to +4tm +tp /6