ABSTRACT
Taking an assembly built up of equipment, it is possible to calculate the accuracy of a cost model in three different ways. These can be defined as follows:
Overall Tolerance (at assembly level or on total of a series) – desired accuracy +/₋5 per cent;
Average Tolerance (the average of the absolute differences) – desired accuracy +/₋10 per cent;
Detailed Tolerance (maximum difference) – desired accuracy +/₋30 per cent.
