# Common Cause and Special Cause [E219]

Page: https://stenobird.com/podcast/diagnosing-the-aftermarket-a-to-z-4411651/common-cause-and-special-cause-e219
Text version: https://stenobird.com/podcast/diagnosing-the-aftermarket-a-to-z-4411651/common-cause-and-special-cause-e219.md
Podcast: [Diagnosing the Aftermarket A to Z](https://stenobird.com/podcast/diagnosing-the-aftermarket-a-to-z-4411651)
Published: 2026-01-14T04:15:00+00:00
Episode link: https://automotiverepairpodcastnetwork.com/common-cause-and-special-cause-e219
Audio file: https://episodes.captivate.fm/episode/9e34d332-9a17-45e3-ac44-c32af1043660.mp3
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JSON: https://stenobird.com/v1/public/podcasts/diagnosing-the-aftermarket-a-to-z-4411651/episodes/common-cause-and-special-cause-e219
Duration seconds: 1111

## Resource

Thanks to our Partner, Pico Technology Watch Full Video Episode Comebacks. Rechecks. Catastrophic parts failures. The stuff that makes everyone’s stomach drop. Matt makes the case that a big part of management’s day-to-day job is not “policing people,” but acting like an investigator—leading with genuine curiosity to figure out what actually happened and what should change. Using Dr. W. Edwards Deming’s framework, Matt breaks problems into two buckets: Common cause: Variation that’s built into the system (processes, tools, training, information flow, software, vendors, documentation, workflow chaos, etc.). These problems are repeatable—and if you don’t change the system, they’ll happen again. Special cause: A true one-off—rare, hard to predict, not systemic. Sometimes the correct response is support, not a giant policy overhaul. The goal: build trust, reduce fear, and improve the shop over time through “constancy of purpose”—not knee-jerk blame. Key Talking Points & Takeaways 1) Management’s role when things go wrong Be an investigator, not a prosecutor. Start with: What happened? Why did it happen? What made it easier to fail than succeed? 2) Deming’s lens: common cause vs. special cause Most problems are common-cause (system-driven), not “someone screwed up.” Mislabeling causes creates chaos: Treating common-cause problems like special-cause ones = scapegoating, fear, repeated failures. Treating special-cause problems like common-cause ones = overcorrecting, unnecessary rules, wasted effort. 3) Examples of common-cause “system” failures (shop edition) Torque wrench out of calibration. Scan tool software out of date / tooling gaps. No real shop management system (handwritten tickets, misreads, manual re-entry). Process interruptions / constant context switching. C…

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## Transcript

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