====== P4-REQ-21-12-009 ======

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

===== Statement =====

Phase 0 SHALL include a prerequisite-checking script or equivalent controlled procedure.

===== Source =====

Part 4, Section 21.12: Script and Execution Requirements.

===== Rationale =====

Generation, build preparation, and execution depend on a valid environment containing required tools, directories, dependencies, configuration, and repository conventions.

A prerequisite check prevents downstream procedures from treating an incomplete or incompatible environment as a valid Phase 0 implementation baseline.

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

This requirement applies to:

  * Phase 0 development environments;
  * required tooling;
  * repository structure;
  * DDS and IDL tooling;
  * Python dependencies; and
  * applicable configuration and environment variables.

===== Verification =====

Verification SHALL confirm that Phase 0 includes a prerequisite-checking script or equivalent controlled procedure.

Verification activities should include review checks confirming that:

  * required tools are checked;
  * required repository locations are checked;
  * applicable configuration is checked;
  * required runtime dependencies are checked; and
  * failed prerequisites prevent uncontrolled downstream execution.

===== Traceability =====

This requirement establishes the controlled environment-validation step preceding applicable Phase 0 generation and execution activities.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-12-001]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-12-003]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-12-010]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-12-script-and-execution-requirements:start]]

===== Status =====

Draft

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