What % of project cost is allocated to preoject monitoring, evaluation and control and why?

if some civl engineering personals can help me, thnaking in anticipationWhat % of project cost is allocated to preoject monitoring, evaluation and control and why?
We call the cost for project monitoring, evaluation, control %26amp; supervision as overhead cost.





Normally the overhead cost ranges from 7% to 15% of the project cost but depending on the type of a project. This percentage cost was included in the derivation of the unit costs of payable items in the project along with the percentage costs for profit, materials, labor/wages, plant/equipment.





The overhead cost contains all the salaries of technical personnels and staff which are not directly involved in the production or shall we say ';the dirty works';. We called these technical personnels %26amp; their staff as ';Indirect Manpowers'; while those directly involved in the production are called ';Direct Manpowers';. The salary of Direct Manpowers falls under the percentage for labor/wages.





';Indirect Manpowers'; are as follows; The Project Managers, The Engineers, Draftsmen, Survey Crew, Laboratory Crew, Accounts, Admin Staff, Clerks %26amp; Service Staff. While the ';Direct Manpowers'; are; Foremen, Equipment Operators, The Skilled Workers, Semi-Skilled Workers and Unskilled Workers.