====== 1.1 Purpose of the Handbook ======

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The purpose of this handbook is to define the practical conventions and development rules for creating, running, inspecting, and reviewing the Phase 0 implementation [[dido:99_annexes:annex-b-terms-and-definitions:b:baseline|Baseline]]. It translates the architectural guidance established in Parts 1 through 4 into implementation-facing practices for [[dido:99_annexes:annex-b-terms-and-definitions:r:repository|Repository]] organisation, development tooling, generated [[dido:99_annexes:annex-b-terms-and-definitions:a:artifact|Artifacts]], [[dido:99_annexes:annex-b-terms-and-definitions:d:dds|DDS]]/[[dido:99_annexes:annex-b-terms-and-definitions:i:idl|IDL]] type generation, [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]] implementation, [[dido:99_annexes:annex-b-terms-and-definitions:c:control_plane|Control Plane]] behaviour, build and run scripts, containerisation, logging, [[dido:99_annexes:annex-b-terms-and-definitions:e:exception_handling|Exception Handling]], [[dido:99_annexes:annex-b-terms-and-definitions:g:git|Git]] workflow, and [[dido:99_annexes:annex-b-terms-and-definitions:a:acceptance_criteria|Acceptance Criteria]].

The handbook exists to prevent Phase 0 from becoming an informal prototype. Phase 0 is a demonstration Baseline, but it should still be disciplined, [[dido:99_annexes:annex-b-terms-and-definitions:r:reproducibility|Reproducible]], traceable, and reviewable. Every source file, generated Artifact, script, [[dido:99_annexes:annex-b-terms-and-definitions:c:configuration|Configuration]] file, container, Node, and topic should have an identifiable purpose within the implementation Baseline and should remain [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceable]] to the architecture or to an explicitly documented implementation need.

The handbook is also intended to support shared team practice. Developers, architects, reviewers, and demonstration participants should be able to use the same conventions when creating Artifacts, reviewing changes, running the system, collecting [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]], and explaining how the Phase 0 Baseline supports the larger Financial Systems Archetype.

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