**PERT**

For demonstration purposes, part of the original problem’s data will be adapted to fit the requirements of PERT.

CPM assumes that the duration of each activity is known with certainty. If this is not the case, PERT attempts to fix that by modelling each activity’s duration as a random variable.

CPM assumes that the duration of each activity is known with certainty. If this is not the case, PERT attempts to fix that by modelling each activity’s duration as a random variable.

**Table 1: Data adapted from original for demonstration of PERT****a = optimistic time estimate**

b = pessimistic time estimate

m = normal time estimate

Tij = random variable denoting the duration of activity (i,j)

E(Tij) = estimated time of activity (i,j)

b = pessimistic time estimate

m = normal time estimate

Tij = random variable denoting the duration of activity (i,j)

E(Tij) = estimated time of activity (i,j)

**Table 2: Summary of calculation data**