The document discusses the Program Evaluation and Review Technique (PERT), which is used for non-repetitive projects to determine whether tasks can be completed by a specific deadline. It emphasizes the importance of time estimates for activities, including optimistic, most likely, and pessimistic times, to calculate expected time. PERT helps in resource reallocation to expedite project completion by analyzing activity dependencies and time requirements.

1. Program Evaluation
and
Review Technique

2. PERT system is preferred for those projects or
operations which are of non repetitive nature.
The main objective in the analysis through PERT is to
find out whether a job could be finished by a given
date/time.
It shows the way how a project cam be finished earlier
than the original schedule. For this, resources may be
re-allocated from activities with spare time to activities
that have no spare time.
Estimating Activity Times:
Once the activities have been specified and the
management has decided, which activity must proceed
and follow others and the network has been drawn, the
next step is to assign the estimates of the times
required to complete each activity.

3. Three time estimates are:
Optimistic Time(t0): It is the minimum time an
activity is expected to take.
Most Likely Time: It is the time an activity is
expected to take most often when it is repeated
under similar circumstances.
Pessimistic Time: It is the time an activity would
take assuming unfavorable conditions.
Expected time(te)=to+4tm+tp /6

4. Steps involved in PERT calculations:
Identify the events and activities and prepare a
suitable network for the given problem.
Events are numbered in ascending order from left
to right.
Obtain the various time estimates for each
activity. They are most likely, the pessimistic and the
optimistic estimates.
Expected time, te=to+4tm+tp /6