Operations / Six Sigma

First-Pass Yield vs Rolled Throughput Yield FPY, RTY

First-pass yield is the share of units that come through a step right the first time with no rework; rolled throughput yield is the chance a unit gets through every step clean.

The fork, why two teams get different numbers

The fork is whether rework counts as a pass.

In the Metric Library

The full fork, both definitions worked all the way through
The trap that makes the number lie, on a real export
Every formula variant, spelled out
The reconciliation anchor, what to tie it to and when to refuse

Get the Metric Library

Reference: Six Sigma yield metrics (FPY / RTY / hidden factory) · ASQ quality convention