====== P4-REQ-21-4-008 ====== [[dido:99_annexes:annex-d-requirements:part-04:start| Return to Requirements]] ===== Statement ===== Each implementation node artefact SHALL report or record observable behaviour according to the Phase 0 logging and exception-handling baseline. ===== Source ===== Part 4, Section 21.4: Logical Node Mapping Requirements. ===== Rationale ===== Observable implementation behavior is necessary for troubleshooting, review, operational understanding, testability, and later evidence planning. Applying the Phase 0 logging and exception-handling baseline ensures that implementation node artefacts expose important lifecycle, processing, warning, failure, and recovery conditions consistently. ===== Applies To ===== This requirement applies to: * implementation node artefacts; * logging behavior; * exception handling; * health and status reporting; and * applicable audit and provenance behavior. ===== Verification ===== Verification SHALL confirm that implementation node artefacts report or record observable behavior according to the Phase 0 baseline. Verification activities should include review checks confirming that: * required lifecycle and processing outcomes are recorded; * warnings and failures are not silently suppressed; * exception handling follows the approved pattern; * recovery conditions are reportable where applicable; and * observable information supports later Part 5 use. ===== Traceability ===== This requirement connects implementation node execution behavior to the Phase 0 logging, exception-handling, observation, and later evidence-planning concerns. Related requirement identifiers: * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-4-004]] * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-4-007]] Related source section: * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-4-logical-node-mapping-requirements:start]] ===== Status ===== Draft ---- © 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.