For any process, you can specify a Good Part Yield or GPY (sometimes referred to as Throughput Yield or TPY) value that represents:

Default GPY values are stored as machine variables and can be overridden as percentage values in the Part Details tab as described below. By default, aPriori sets all Good Part Yield values to “1” (100%).

Final Yield (or FY) differs from Good Part Yield in that it is calculated for all downstream processes rather than just for the current process. Final yield is displayed in the Part Details tab and is used to calculate material cost.

Calculations involving yield values make use of production volume and the number of scrap parts at the process and routing level. Examples of scrap parts are damaged, broken, or out of tolerance parts. Note that aPriori does not include reworked parts in scrap calculations.

It is important to understand that yield calculations begin at the end of the routing, using the Total Production Volume as the starting point, and working upstream, process by process. The relationship of volume, scrap, and yield in the aPriori environment is summarized in the following illustration:

The end result of yield calculations is that the manufacturing process may require more material, direct labor, and direct overhead in each process.