Construction Planning and Management
If to, tp and tm are the optimistic, pessimistic and most likely time estimates of an activity respectively, the expected time t of the activity will be

to + 4tm+ tp/4
to + 4tm+ tp/5
to + 4tm+ tp/6
to + 3tm+ tp/3

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Construction Planning and Management
Preliminary project report for a road project must contain

The several alternatives of the project that have been considered
The detailed estimated cost based on detailed design
The contract documents for inviting tenders
The soil survey, traffic survey, concept design and approximate cost

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