Schedule of rates or list of rates of different items is made after the analysis of rates of these items. This type of document is called the schedule of rates or S.O.R. It is made by large concerns or public bodies. It becomes very helpful, particularly in deciding the rate of an extra item, carried out by the contractor. A schedule of rates for each kind of work is maintained by the various engineering department or authorized organizations in the form of a printed books called "Schedule of Rate Books". Propertiesof SOR/CSR:- 1. Schedule of rates includes the rate of wages of labour, rate per unit of different items of work and materials, and rates of transport and it also consists of groups of items like excavation items, demolishing items, brickwork items concrete items, etc. 2. As the rates of items noted in the schedule of rates are likely to vary. 3. The schedule of rates is regularly updated, generally after three years. 4. I...