Six Sigma Rolled Throughput Yield

摘要

Leading proponents of Six Sigma recommend the use of "rolled throughput yield" (RTY) as an aggre- gate measure of overall process performance. This article will describe RTY in more detial and provide a procedure for computing statistical control limits. The use of RTY to construct a "forecasted Pareto" will also be discussed. Rolled throughput yield is computed as the product of the yield at each step of a process. IN this regard, RTY is simi- Lar to total process yield (TPY), although leading works on Six Sigma define RTY based on Poisson counts of defects, Whereas TPY was based on binomial counts of defectives.