Program Evaluation and Review Technique (PERT)
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Standard Deviation
the square root of the sum of the variances of the individual activities.
Mean project duration
a straightforward sum of critical path activity means
When is PERT used
projects where there is insufficient historical knowledge for estimating project activity duration's
Standard Deviation
provides an indication of the uncertainty associated with the mean estimate of activity duration.
PERT Recognizes what
the probabilistic nature of activity duration's as opposed to the deterministic assumptions that CPM incorporates.