Construction Planning and Management
During the construction period, price variation clause in contracts caters to

Rate of inflation
Increase in rates of only important materials
Variation in total cost of the project on an ad hoc basis
Variation in cost in materials element, labour element and petrol-oil-lubricant element

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

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

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