Five Whys Root Cause Analysis

Root cause analysis for system failures uses the five whys methodology to iteratively ask why an observed symptom occurred, gathering evidence from code and logs, until an actionable root cause is found.

The five whys methodology is an evidence-based investigation process that enforces structured root cause identification by repeatedly asking why, preventing speculation-driven debugging and wasted engineering effort.

To stop speculation-driven debugging, apply iterative why questioning by reading code, logs, and config outputs to gather evidence at each step until a concrete root cause ready for a fix is identified.

Use five whys for problem-solving across codebases and deployments when you face debugging sessions, system failures, or quality issues and need to identify actionable root causes before attempting solutions.

A root cause analysis is complete when the iterative why questioning reaches a concrete, actionable root cause verified by gathered evidence, meeting clear criteria that the underlying issue is identified and ready for a fix.