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The Systematic Debugging skill provides a disciplined framework for troubleshooting complex software issues, moving beyond trial-and-error 'guessing.' It mandates an 'Iron Law' of root cause investigation before any code changes are made. By guiding developers through a structured four-phase process—tracing data flow, identifying divergences, forming testable hypotheses, and verifying fixes—this skill ensures that bugs are permanently resolved rather than merely masked. It is particularly effective for resolving race conditions, data corruption, performance bottlenecks, and elusive environment-specific errors.