Create a small contamination audit with a clear plan, sample method, defect categories, and control follow-up.
Route 9 has a rejected load, conflicting explanations, and no baseline by segment. Plan, Do, Check, Act: define the question, collect consistent evidence, compare the pattern, and act with a control check. The common trap is to inspect the worst-looking carts only, then treat the result as if it represents the whole route. PDCA audit loop Plan Decide the question, sample, categories, and decision threshold. Do Inspect the same way each time and record evidence. Check Compare defect patterns by segment or source. Act Target the intervention and schedule a repeat check. Audit 30 carts: 10 apartment, 10 single-family, 10…
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