Rolled Throughput Yield (RTY)

A measure of the true yield or capability of a process (generally made up of sub-processes). The calculation is (FTY_ProcessA x FTY_ProcessB x FTY_ProcessC x FTY_ProcessD x etc.). It can help expose "hidden factories" for processing that could risk defects or delays. The measurement of every sub-process should be rolled up to measure their contribution to the overall process they support. Compare to First Time Yield (FTY).
Related StatStuff Video: 
   -Section 2-Lean, Lesson #10 - FTY and RTY