Concept ≠ Plan
The concept keeps possibilities open; the plan decides what is implemented, tested, or explicitly excluded now.

The concept keeps possibilities open; the plan decides what is implemented, tested, or explicitly excluded now.
Objective, scope, non-scope, and critical assumptions create a stable starting point.
The riskiest assumption is tested early through a small but complete end-to-end slice.
Work is ordered by learning dependencies rather than calendar logic alone.
The first plan is a hypothesis. Sources, methods, and evidence reshape the next planning wave.