An interactive concept flow for module boundaries should follow change, from its assumptions through the main operation and boundary checks.
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readyA module groups decisions that are likely to change together and hides details other modules do not need. A useful boundary reduces the number of places that must change for one product decision. The public interface should express stable intent rather than expose internal storage or control flow.
Use the stages in order to explain module boundaries should follow change. Each stage makes one assumption visible: what the operation promises, what representation it uses, how state changes, which boundary can invalidate a shortcut, and what evidence confirms the result.
For a worked explanation, continue to the topic article and execution trace.
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