====== NOD-004a — Establish the Initial Node State ======
[[dido:03-dido-te:99-annexes:annex-c-requirements:03-functional-requirements:03-02-node-requirements:nod-004-control-the-node-lifecycle:start|Go to NOD-004 — Control the Node Lifecycle]]
===== Statement =====
The [[dido:99_annexes:annex-b-terms-and-definitions:d:dido-te|DIDO-TE]] SHALL establish the initial state of each [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]] before initiating a Node lifecycle transition.
===== Derived From =====
* [[dido:03-dido-te:99-annexes:annex-c-requirements:03-functional-requirements:03-02-node-requirements:nod-004-control-the-node-lifecycle:start|NOD-004 — Control the Node Lifecycle]]
* [[dido:03-dido-te:99-annexes:annex-b-references:dte-005|[DTE5] DIDO-TE Requirements Register]], source requirement identifier and obligation to be assigned
* [[dido:03-dido-te:99-annexes:annex-b-references:dte-006|[DTE6] Structured Information Processing Reference Architecture (SIP-RA)]]
* [[dido:03-dido-te:99-annexes:annex-b-references:dte-007|[DTE7] Federated Data Interpretation Systems Reference Architecture (FDIS-RA)]]
===== Rationale =====
The initial Node state provides the controlled starting point for subsequent lifecycle operations. It identifies the actual condition of the Node before the DIDO-TE starts, activates, suspends, resumes, stops, restarts, recovers, or terminates it.
The applicable [[dido:99_annexes:annex-b-terms-and-definitions:n:node_definition|Node Definition]], [[dido:99_annexes:annex-b-terms-and-definitions:n:node_implementation|Node Implementation]], and [[dido:99_annexes:annex-b-terms-and-definitions:n:node_configuration|Node Configuration]] determine the permitted initial states and the criteria for establishing them.
An unknown, ambiguous, unauthorized, or unsuitable initial state prevents the DIDO-TE from determining whether a requested lifecycle transition is valid. Residual processes, data, connections, locks, resources, or configuration from an earlier operation may also affect subsequent [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]].
Establishing and recording the initial state supports lifecycle control, reproducibility, fault isolation, recovery, [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]], and [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]].
===== Applies To =====
* [[dido:99_annexes:annex-b-terms-and-definitions:d:dido-te|DIDO-TE]]
* [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]]
* [[dido:99_annexes:annex-b-terms-and-definitions:n:node_definition|Node Definition]]
* [[dido:99_annexes:annex-b-terms-and-definitions:n:node_implementation|Node Implementation]]
* [[dido:99_annexes:annex-b-terms-and-definitions:n:node_configuration|Node Configuration]]
* [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definition]]
* [[dido:99_annexes:annex-b-terms-and-definitions:t:test_environment|Test Environment]]
* [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]]
* [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]
* [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]]
===== Verification =====
Verification confirms that:
* The DIDO-TE uniquely identifies the Node before establishing its initial state.
* The Node Definition or Node Implementation identifies the permitted initial states.
* The DIDO-TE uses identified and authorized criteria and procedures to determine the initial Node state.
* The DIDO-TE observes the actual Node state rather than relying solely on an intended or previously recorded state.
* The DIDO-TE identifies active processes, services, connections, bindings, resources, and applicable persistent data associated with the Node.
* The DIDO-TE identifies residual Node activity or state from an earlier operation.
* The DIDO-TE confirms that the initial Node state satisfies the applicable Node Definition, Node Implementation, Node Configuration, Test Definition, and Test Environment constraints.
* The DIDO-TE detects an unknown, ambiguous, conflicting, unauthorized, or unsuitable initial Node state.
* The DIDO-TE prevents a lifecycle transition when the initial Node state does not satisfy the transition preconditions.
* The DIDO-TE identifies the corrective or recovery action required when the initial Node state is unsuitable.
* The DIDO-TE records the Node identity, observed state, applicable criteria, procedure, authority, time, findings, exceptions, and resulting status.
* Repeated determination of an unchanged initial Node state under equivalent conditions produces an equivalent result.
* The DIDO-TE maintains Traceability among the Node Definition, Node Implementation, Node Configuration, Test Definition, Test Environment, observed initial state, findings, exceptions, and resulting Evidence.
* An unknown, ambiguous, unauthorized, unsuitable, incorrectly determined, or untraceable initial Node state constitutes nonconformance with this requirement.
Verification includes:
* Inspection of the Node identity
* Inspection of permitted initial states and transition preconditions
* Inspection of the authorized state-determination criteria and procedure
* Observation of the actual Node state
* Inspection of active processes, services, connections, bindings, resources, and persistent data
* A negative assessment involving an unknown initial state
* A negative assessment involving residual activity from an earlier operation
* Confirmation that an unsuitable initial state prevents a lifecycle transition
* Inspection of findings, exceptions, recovery actions, Evidence, and Traceability
===== Referenced By =====
{{backlinks>.}}
===== Related Architecture Sections =====
* Add links to the architecture sections governing Node lifecycle states, lifecycle transitions, Node Configuration, Test Environment control, recovery, Evidence, and Traceability.
===== Delivery Phase =====
Assign the applicable delivery phase.
===== Requirement Status =====
Draft
===== Statement Reference =====
Use the following syntax to reference this requirement’s Statement section from another DokuWiki page:
{{section>dido:03-dido-te:99-annexes:annex-c-requirements:03-node-requirements:nod-004-control-the-node-lifecycle:nod-004a-establish-the-initial-node-state#Statement&noheader&nofooter&noeditbtn}}
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