A Simple Timed Checklist That Helps Developers Break Free from Debugging Bias

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A software engineer spent over two hours convinced a bug stemmed from their own recent code changes, only to discover the real culprit was a legacy codegen sync script unrelated to their work. The experience highlighted how confirmation bias leads developers to repeatedly examine the same evidence while ignoring other possibilities. To counter this, the engineer relies on a pre-set checklist that requires stepping away from a problem after a fixed time limit, typically two hours, and performing a deliberate break activity before resuming. The checklist is designed not as a productivity tool but as a structural safeguard, making the decision to pause before pressure and tunnel vision set in. The author argues that simply knowing about cognitive bias is insufficient, and that only a rule-based system, decided in advance, can reliably interrupt biased reasoning in the moment.

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