====== P4-REQ-21-8-008 ======

[[dido:99_annexes:annex-d-requirements:part-04:start| Return to Requirements]]

===== Statement =====

Each interaction realization SHALL identify the required logging and exception-handling behavior.

===== Source =====

Part 4, Section 21.8: Interaction Pattern Realization Requirements.

===== Rationale =====

Interaction execution must expose sufficient operational information to make successful processing, warnings, degradation, failures, and recovery behavior reviewable.

Defining logging and exception-handling behavior ensures that important processing conditions are not silently hidden and supports later observation and evidence planning.

===== Applies To =====

This requirement applies to:

  * interaction realizations;
  * logging behavior;
  * exception handling;
  * processing outcomes; and
  * participating implementation artifacts.

===== Verification =====

Verification SHALL confirm that each interaction realization identifies its required logging and exception-handling behavior.

Verification activities should include review checks confirming that:

  * required processing events are logged;
  * failures are not silently suppressed;
  * exceptions follow approved handling patterns;
  * applicable warnings and recovery actions are recorded; and
  * behavior conforms to the Developer Handbook.

===== Traceability =====

This requirement connects Phase 0 interaction realizations to the logging and exception-handling conventions defined by Part 4.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-8-007]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-8-009]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-4-008]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-8-interaction-pattern-realization-requirements:start]]

===== Status =====

Draft

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