7.12 Communication Direction and Coupling

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Communication Direction specifies the logical flow of information between Logical Nodes and Logical Communication Endpoints.

The Logical Architecture supports one-way exchange, two-way exchange, request/response exchange, command/acknowledgement exchange, event production and consumption, and other directed exchange patterns. Communication Direction describes the logical flow of information, not the physical network route or protocol behaviour.

Logical coupling describes the degree to which a Logical Node depends on another Logical Node, endpoint, information structure, timing expectation, or response expectation. The Logical Communication Model favours explicit coupling over hidden coupling. A logical interaction identifies the dependency so reviewers can assess governance, Traceability, resilience, Compatibility, and Evidence expectations.

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