# Official sources

Use this reference when grounding current AWS service behavior for this role.

- https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets.html
- https://docs.aws.amazon.com/prescriptive-guidance/latest/choosing-git-branch-approach/plan-your-change-management-strategy.html
- https://docs.aws.amazon.com/systems-manager/latest/userguide/change-calendar.html
- https://docs.aws.amazon.com/wellarchitected/latest/operational-excellence-pillar/design_principles.html

## Grounding rule

Docs explain service behavior. They do not prove the user's deployed state, ownership, SLAs, budget posture, or current incident reality.
