Program evaluation and review techniques (PERT)

Critical Path methods (CPM)

It’s origin in military and usually used in research & development type project like defense

It’s origin in industry. It is used in construction industry bridge, dams, tunnels, high way etc.

Event oriented approach

Activity oriented approach

Allows uncertainty

Does not allow uncertainty

It is probabilistic model

It is deterministic model

Time based

Cost based

Doesn’t demarcate between critical and non-critical activities

Marks critical activities

Average the time

Doesn’t average the time

Suitable when high precision is required.

Suitable when accurate precision is required.