Increase the share of product that passes without rework.
First pass yield measures the proportion of units that complete a process correctly without rework, repair, retest, or repeated processing. It helps expose hidden quality losses that consume capacity even when final scrap appears low.
Measure the flow losses that happen between machine cycles.
Waiting, queues, rework, quality loss, release rules, inspection, and material movement can dominate total lead time even when individual machines are fast.
Reduce delay and quality loss without destabilizing production.
The best changes shorten flow time, reduce excess WIP, improve first-pass output, and prevent scrap from moving farther downstream.
CRIT-ACount Rework as Loss
A part that eventually passes after repair or retest still consumed extra production capacity and should not be counted as first-pass success.
Related Guide →CRIT-BInspect at the Right Point
Detecting defects closer to the process that creates them reduces the amount of downstream work wasted.
Related Guide →CRIT-CConnect Defects to Process
Product, recipe, tooling, machine state, and process data help determine whether defects are random or systematic.
Related Guide →CRIT-DWatch Constraint Yield
Quality loss at the system bottleneck consumes capacity that cannot be recovered elsewhere.
Related Guide →Relevant quality and production resources.
References are selected from the approved TempoJS industrial link inventory.