dev-debuglisted

# Debug a Problem ## Goal Identify the root cause of a bug methodically via a systematic 4-phase approach. ## Systematic Methodology (4 Phases) ``` ┌──────────────────────────────────────────────────────────────────┐ │ SYSTEMATIC DEBUGGING │ ├──────────────────────────────────────────────────────────────────┤ │ │ │ PHASE 1: OBSERVATION Collect without interpreting │ │ ═══════════════════ │ │ - Reproduce the exact symptom │ │ - Document the environment │ │ - Capture logs, stack traces, states │ │ - DO NOT jump to conclusions │ │ │ │ PHASE 2: HYPOTHESES Reason systematically │ │ ════════════════════ │ │ - List ALL possible causes │ │ - Rank by probability (high/medium/low) │ │ - Define a validation test for each hypothesis │ │ - Use the 5 Whys technique │ │ │ │ PHASE 3: INVESTIGATION Prove, do not assume │ │ ═════════════════