(Contributed by W. H. Brown, F.S.I.)

The Bill may be continuous - that is, all trades may be bound together in one document, the total of each trade being carried to a Summary at end; or each trade may constitute a separate Bill, or two or three trades may be bound together in one Bill. In this case each Bill will have its Summary, which will in turn be carried to a General Summary. For a small job the Bill is usually continuous, but for large buildings it facilitates the work of the Estimator to split it up into several sections. In such works as large Hospitals or Asylums it will often be most convenient to make a Bill of all trades (as a Continuous Bill is called) of each separate building, in the case of the main buildings; and to group the smaller and less important buildings together into one or more groups, making a Bill of all trades of each group. This method makes the adjustment of variations much simpler. The Bill should be headed somewhat as follows:-