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Reducing rework caused by wrong calls on the line

A meaningful share of your rework does not come from a broken machine or a missed spec. It comes from a person making the wrong call in the moment: carrying on when they should have stopped, adjusting when they should have held, or deciding without the information to decide well. You reduce this rework by improving the calls, not by adding another inspection step.

Rework is expensive and most of it is hidden. The cost of poor quality, mostly rework and scrap, runs 15 to 20 percent of sales in typical operations (ASQ). On a 300 crore business that is 45 to 60 crore a year. A real part of that traces back to decisions, and that part is recoverable once you can see it.

Separate machine rework from decision rework

Before you can reduce decision-driven rework, you have to find it. Take your rework log and split each item: was this a machine or material fault, or was it a call someone made? Your quality system already catches most of the machine side. The decision side usually sits unlabelled, blamed on "operator error," and never actually fixed.

The wrong call is the root, not the symptom. That call is Decision-at-the-Edge, the call a person makes in the moment, and it is the hidden driver of rework. The hub guide on why supervisors escalate defines it, and the first-time-right guide covers the quality angle in full.

Why more inspection does not cut it

Adding inspection catches the defect later, after the time and material are already spent. It does not stop the wrong call that caused it. You end up paying twice: once to make the bad part and again to find it. The only way to actually reduce the rework is to fix the decision upstream, on the line, before the part is made.

How to reduce decision-driven rework

  1. Go through your rework log and tag each item: machine or material, or a decision someone made. Be straight about the "operator error" pile.
  2. For the decision pile, name the calls behind the defects, one situation at a time.
  3. Tell apart the calls a person knows but botches in the moment from the calls they have never learned to make.
  4. Build the judgment on those calls upstream, on the line, and track the decision-tagged rework coming down.

This is the Diagnostic Gap Model applied to your rework number. You close the judgment gap behind the defects. The hub guide covers the model.

How you will know it worked

The decision-caused share of your rework falls, and you can point to it specifically because you separated it out at the start. That is the number that moves your cost of poor quality, and it shows up on your P&L.

Where this fits

This is one piece of building decision quality on your floor, and it is where decision quality meets your rework cost directly. The full picture is in the hub guide on why supervisors escalate and how to fix it. PDGMS HCD is the system that builds and proves it.

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