The product specification that details the operations required to build a standard construction project. It covers the costs of inputs (labour, materials and plant), subcontracting, preliminaries and overheads. It also covers contractor’s profit or loss, architect’s and engineer’s fees and non-deductible taxes. A bill of quantities is structured to provide a weighted price for each component specified which, when summed across components, provide the purchasers’ price for the standard construction project described.