Object-oriented analysis identifies domain concepts and rules. Design assigns those rules to collaborating objects.
Example
Order owns confirmation rules; Inventory owns stock; checkout coordinates them; payment infrastructure contacts the provider.
When to choose it
A transaction script is simple. A domain model centralizes rules but adds concepts and indirection. Start with one use case and a responsibility table. Name who handles failure and rollback. Microsoft
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Review our checkout use case. Identify domain concepts, invariants, and responsibility owners. Compare a transaction script with a small domain model using our actual complexity. Ask about unresolved boundaries; do not add an inheritance tree by default. Return a responsibility table, call sequence, failure ownership, and tests.
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