Construction Planning and Management
In the time-cost optimisation, using CPM method for network analysis, the crashing of the activities along the critical path is done starting with the activity having

Least cost slope
Shortest duration
Longest duration
Highest cost slope

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

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

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