Phase 4 — Debug & Master

Chapters 42, 43: Debugging and TDG Independence

Your role: Debugger — "I can diagnose failures and drive TDG without scaffolding"

Phase 4 is the checkpoint between guided learning and independent practice. You learn to read error messages as diagnostic information (not text to paste back into the prompt), recognize the common failure patterns of AI-generated code, and follow a systematic debugging loop: reproduce, isolate, identify, fix, verify. By the end, you drive the full TDG cycle independently — from a problem statement through specification, testing, generation, and verification — without scaffolding.

#	Chapter	Key Focus
42	Debugging AI-Generated Code	Systematic diagnosis of AI failures
43	TDG Mastery — The Complete Cycle	The full cycle without scaffolding