Errors are systemic. And that's why they're systemically preventable. But the cost isn't just some rework; a substantial portion of most organizations exists just to deal with errors. And it's not just a cost problem; it's a capacity problem. Every error creates work that wasn't in the plan. Rework, re-inspection, re-setup, re-order (with overnight expedite), injuries, broken machines, scrap replacement, the extra changeover to go back and fix a run. None of it adds value,