How is first-pass yield calculated?

Divide the inspections that passed on their first attempt by the total number of inspections performed, then multiply by 100. An area, a system, or a unit that fails and gets corrected before a second inspection does not count toward the first-pass number, even though it eventually passes, because the measure is about getting it right the first time, not about eventually passing. A trade that runs 140 inspections and passes 119 of them on the first look has an 85 percent first-pass yield, and the other 21 represent rework that a cleaner process would have avoided.

What is a good first-pass yield on a construction project?

There is no single number that applies to every trade or scope, but most quality programs treat anything consistently above 90 percent as healthy and anything drifting below 80 percent as worth investigating. What matters more than the absolute number is the trend and the breakdown by trade, crew, or area, because a falling first-pass yield on one trade usually points to a specific cause, a new crew, a drawing issue, a material substitution, before it shows up anywhere else on the project.

Why does first-pass yield matter more than the raw inspection pass rate?

Because a raw pass rate counts the second and third attempts as successes, which hides exactly the problem a quality program needs to see. If an item fails, gets reworked, and passes on the second try, the raw pass rate eventually reads 100 percent even though the work took three passes instead of one. First-pass yield only counts the first attempt, so it keeps rework visible instead of letting it disappear into an eventual pass, which is what makes it the measure worth tracking over time.

Construction Glossary · Quality & Field

First-PassYield

A raw pass rate counts the third try the same as the first. First-pass yield does not let rework hide behind an eventual pass.

Definition

First-pass yield is the share of work that passes inspection the first time, with no rework needed, a quality efficiency measure. A high first-pass yield means less rework, less schedule drag, and a lower cost of quality; a low one signals a process, trade, or crew worth watching.

Where the 15 percent goes

On 140 inspections, 119 pass the first time. The other 21 do not vanish, they become rework, and that is exactly what first-pass yield is built to keep visible. A raw pass rate would eventually show all 140 as passed, once every retest clears, which quietly erases the fact that 21 of them took a second look. First-pass yield refuses that erasure by only ever counting the first attempt, trade by trade and area by area.

Two measures of the same inspections

Both numbers come from the same inspection log. One of them hides rework; the other does not. The difference only shows up once someone asks how many attempts each item actually took, a question the raw pass rate was never built to answer and first-pass yield was built specifically to track, down to the trade or crew where attempts keep climbing.

Measure	What it counts
Raw pass rate	Eventually passed, any number of attempts
First-pass yield	Passed on the first attempt only

The source event is the construction inspection, and the 21 that failed are now tracked as rework.

How POD handles it

First-pass yield is not a metric POD computes today, because it does not capture a structured inspection pass/fail record to derive it from. Where first-time failures are logged as non-conformance reports, POD surfaces those NCRs and their cost and schedule impact instead. POD reads what you record; it does not judge the work.

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Frequently asked questions

The 15 percent has a cost and a cause

Every point of first-pass yield lost becomes labor, material, and schedule spent redoing work that should have been right the first time. Tracked by trade and by root cause, that lost point usually points straight at a specific crew, a specific drawing revision, or a specific material substitution, long before it shows up in a monthly cost report.

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