Based on the illustration, the phase of the ADM labeled as item 2 is the Implementation Governance phase. This phase provides architectural oversight for the implementation. It ensures that the implementation project conforms to the architecture. It also provides a framework for monitoring and managing the implementation.

The Implementation Governance phase involves the following activities:

Finalizing the Architecture Roadmap and the supporting Implementation and Migration Plan

Assigning an Architecture Board to oversee the implementation

Establishing Architecture Contracts with the implementation partners

Reviewing and approving the implementation project plans and deliverables

Performing Architecture Compliance reviews to ensure alignment with the architecture

Performing Architecture Audit reviews to ensure quality and performance of the architecture

Resolving any architecture issues or change requests that arise during the implementation

Maintaining the architecture lifecycle and ensuring its continuity

The Implementation Governance phase is essential for ensuring that the architecture is realized as intended and that it delivers the expected business value and outcomes.

References: : Implementation Governance