Production defect logic tree

This logic tree organizes a manufacturing defect investigation around inputs and process conditions. It asks whether the materials changed, whether the process changed, and whether the measurement system is reporting consistently. The branches avoid a common error: changing machine settings before confirming the supplier lot or the inspection method. Each leaf points to an evidence source such as lot records, maintenance history, change control, or gauge checks. Use the tree with containment actions that protect customers while the investigation proceeds. Expand it with product-specific factors only after the broad causes have been assessed. It gives readers a concise reference they can reuse when discussing the result with colleagues.