Industrial Engineering and Production Management
Earliest finish time can be regarded as

Latest finish time + duration of activity
Earliest start time duration of activity
Latest finish time duration of activity
Earliest start time + duration of activity

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Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Guessed times are used in PERT and evaluated times in CPM
PERT deals with events and CPM with activities
Critical path is determined in PERT only
Costs are considered on CPM only and not in PERT

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