====== P4-REQ-21-2-007 ======

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

===== Statement =====

The Phase 0 Implementation Profile / PSM SHALL NOT define the final implementation architecture for all later development phases.

===== Source =====

Part 4, Section 21.2: Phase 0 Profile Requirements.

===== Rationale =====

Phase 0 establishes a phase-specific implementation baseline rather than a permanent implementation architecture. Later development phases may introduce additional capabilities, technologies, mappings, governance mechanisms, or implementation patterns.

Restricting Phase 0 to its selected scope prevents current implementation decisions from unnecessarily constraining later development phases.

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

This requirement applies to:

  * the scope of the Phase 0 Implementation Profile / PSM;
  * Phase 0 implementation mappings;
  * Phase 0 technology selections;
  * Phase 0 implementation constraints; and
  * planning for later implementation profiles.

===== Verification =====

Verification SHALL confirm that the Phase 0 Implementation Profile / PSM does not claim to define the final implementation architecture for all later development phases.

Verification activities should include review checks confirming that:

  * Phase 0 implementation choices are identified as phase-specific;
  * later-phase capabilities are not treated as mandatory Phase 0 capabilities;
  * the profile permits controlled evolution through later implementation profiles; and
  * Phase 0 does not preclude compatible later-phase extensions.

===== Traceability =====

This requirement establishes the boundary between the Phase 0 implementation baseline and later implementation profiles.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-2-001]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-2-004]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-2-008]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-2-phase-0-profile-requirements:start]]

===== Status =====

Draft

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