Where a project involves specialist sub-contractors. We just had a tender and tenderers submitted their offer while doingthe tender report the engineer stated that one provisional item should be increase. Other examples of items that can be covered by cash allowances could be testing and inspection, sculptures, murals, landscaping, site furnishings, special hardware, special equipment, owner purchased products, and of course specialty mill-work. Where the precise details of a part of the works is not finalised. The parties should make it clear that the provisional sum will be replaced by the actual cost of the work, otherwise the contractor may argue that it is entitled to the provisional sum plus the actual cost. When the item of work in the Provisional Sum is executed by a utility agency or by a sub contractor, the mark up on PS item to be paid to the main contractor, what are the duties and responsibilities of the main contractor? In a contract where the contractor is expected to cover the consultant accommodation with provisional sum of payment per month can the payment approving engineer has the right to ask for detailed expense justification testimonials before approval?