====== MO-003b — Provider-Independent Crucible Description ======

[[dido:02-crusible:99-annexes:annex-c-requirements:01-mission-objectives:mo-003:start|Go to MO-003 — Cloud-Agnostic Deployment]]

===== Statement =====

[[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]] SHALL use the same identified version of the provider-independent [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible_description|Crucible Description]] for each selected [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_platform|Deployment Platform]].

===== Derived From =====

This requirement derives from:

  * [[dido:02-crusible:99-annexes:annex-c-requirements:01-mission-objectives:mo-003:start|MO-003 — Cloud-Agnostic Deployment]]

The Original Requirement states:

> //The system SHALL provide cloud-agnostic deployment capabilities.//[[dido:02-crusible:99-annexes:annex-b:cr-002|[C2]]]

MO-003b preserves the portion of the Original Requirement that requires common provider-independent deployment intent across the selected Deployment Platforms.

The separate requirements derived from MO-003 address:

  * [[dido:02-crusible:99-annexes:annex-c-requirements:01-mission-objectives:mo-003:mo-003a|MO-003a — Cross-Platform Deployment]]
  * [[dido:02-crusible:99-annexes:annex-c-requirements:01-mission-objectives:mo-003:mo-003c|MO-003c — Provider-Independent Infrastructure Baseline]]
  * [[dido:02-crusible:99-annexes:annex-c-requirements:01-mission-objectives:mo-003:mo-003d|MO-003d — Limitation of Provider-Specific Dependencies]]

===== Rationale =====

A provider-independent [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible_description|Crucible Description]] allows the same deployment intent to apply across multiple Deployment Platforms.

Using the same identified version prevents a change of Deployment Platform from implicitly changing the provider-independent deployment intent.

The Crucible Description should express the required deployment without embedding the proprietary interfaces, services, data formats, software development kits, or operational mechanisms of a particular Cloud Provider.

Platform-specific information remains separate from the provider-independent Crucible Description. A [[dido:99_annexes:annex-b-terms-and-definitions:p:provider_implementation|Provider Implementation]] translates the provider-independent deployment intent into mechanisms supported by the selected Deployment Platform.

Using the same identified version supports:

  * Consistent deployment intent
  * Controlled comparison of deployment results
  * Change control
  * Detection of provider-specific information within provider-independent content
  * Reuse across supported Deployment Platforms
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]]

This requirement does not require use of the same Infrastructure Baseline. MO-003c addresses that outcome.

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

This requirement applies to:

  * [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:c:cloud_agnosticism|Cloud Agnosticism]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible_description|Crucible Descriptions]]
  * Crucible Description identifiers
  * Crucible Description versions
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_independent_information|Platform Independent Information]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_specific_information|Platform Specific Information]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_specific_parameter|Platform Specific Parameters]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_platform|Deployment Platforms]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:provider_contract|Provider Contracts]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:provider_implementation|Provider Implementations]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:i:infrastructure_deployment|Infrastructure Deployments]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:a:artifact|Artifacts]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]]

===== Verification =====

Verification confirms that:

  - Two or more selected [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_platform|Deployment Platforms]] are identified
  - The provider-independent [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible_description|Crucible Description]] is identified
  - Each deployment uses a Crucible Description with the same identifier
  - Each deployment uses the same identified version of the Crucible Description
  - The Crucible Description contains provider-independent deployment intent
  - Changing the selected Deployment Platform does not require modification of the identified Crucible Description version
  - [[dido:99_annexes:annex-b-terms-and-definitions:p:platform_specific_information|Platform Specific Information]] remains separate from the provider-independent Crucible Description
  - Each deployment record identifies the Crucible Description identifier and version used for the selected Deployment Platform
  - The verification record preserves [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]] among the Crucible Description, selected Deployment Platform, Provider Implementation, platform-specific information, and deployment result

===== Referenced By =====

The following pages reference this requirement:

{{backlinks>.#dido:02-crusible}}

===== Delivery Phase =====

Implemented and Verified

===== Implementation Status =====

<todo>Assess whether deployments to the selected Deployment Platforms use the same identified version of the provider-independent Crucible Description.</todo>

===== Requirement Status =====

<todo>Review and accept MO-003b as a proposed derived requirement created from the evaluation and decomposition of MO-003 in the Crucible System Requirements Specification, Version 1.1 Draft.</todo>

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===== Issues =====

The following unresolved issues affect this requirement:

<todo>Define the provider-independent information that the Crucible Description must contain.</todo>

<todo>Define the provider-specific information that must remain separate from the Crucible Description.</todo>

<todo>Identify the controlling source that defines the boundary between provider-independent and provider-specific information.</todo>

<todo>Determine whether changing the selected Deployment Platform may require any controlled transformation of the Crucible Description without creating a new Crucible Description version.</todo>

<todo>Define the identifier and versioning rules used to determine that each deployment uses the same Crucible Description.</todo>

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===== Notes for Editors =====

This requirement page should retain the stable requirement identifier ''MO-003b''.

This page is a leaf requirement page and omits a trailing '':start'' from its namespace.

The parent MO-003 page is a non-leaf page and retains a trailing '':start'' in its namespace.

Changes to the Statement should preserve:

  * [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]] as the responsible actor
  * The provider-independent [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible_description|Crucible Description]] as the common source of deployment intent
  * Use of the same identified Crucible Description version across the selected Deployment Platforms
  * Separation of provider-independent and provider-specific information

The unresolved boundary between provider-independent and provider-specific information should remain recorded in the Issues section until a controlling source defines it.

Material changes should receive review and should update the verification criteria, source records, and Issues section.

To reference this requirement Statement from another wiki page, insert:

<code dokuwiki>
{{section>dido:02-crusible:99-annexes:annex-c-requirements:01-mission-objectives:mo-003:mo-003b#Statement&noheader&nofooter&noeditbtn}}
</code>

Do not rename this page after an external citation unless a redirect or move plan is in place.

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