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

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

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Industrial Engineering and Production Management
The assumption in PERT is

Cost of project will always be more than the estimated cost, if no timely corrections are taken
Activities are fixed and can't be changed
A project can be subdivided into a set of predictable, independent activities
A project will always be behind schedule, if left uncorrected

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