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

The chart shown is a Gantt chart, which is commonly used for project management to illustrate a project schedule. In the context of TOGAF (The Open Group Architecture Framework), which is a framework for enterprise architecture, this Gantt chart is demonstrating the sequenced approach to the Architecture Development Method (ADM). The ADM is the core process of TOGAF which provides a tested and repeatable process for developing architectures. The ADM is described as being iterative, over the whole process, between phases, and within phases. For each iteration of the ADM, a fresh decision must be taken about each of the parameters (scope, granularity, time period, and architecture assets).
The ADM consists of a number of phases that have to be followed in sequence:
* Preliminary Phase: Framework and principles
* Phase A: Architecture Vision
* Phase B: Business Architecture
* Phase C: Information Systems Architectures, including Data and Application Architectures
* Phase D: Technology Architecture
* Phase E: Opportunities and Solutions
* Phase F: Migration Planning
* Phase G: Implementation Governance
* Phase H: Architecture Change Management
* Requirements Management
Each phase is dependent on the outputs of the previous phase and the Requirements Management phase runs throughout. The Gantt chart clearly shows the dependency and sequence in which these phases occur, implying that a structured approach is followed to produce the enterprise architecture.
References:
* The TOGAF Standard, Version 9.2, a standard of The Open Group
* The TOGAF documentation available at https://publications.opengroup.org/standards/architecture and
https://publications.opengroup.org/guides/architecture

The Request for Architecture Work is a deliverable that is sent from the sponsor and triggers the start of an architecture development cycle. It defines the scope, budget, schedule, and deliverables for a specific architecture project. The Statement of Architecture Work is a deliverable that is produced by the architect and defines the approach and resources needed to complete an architecture project. It forms the basis of a contractual agreement between the sponsor and the architecture organization. The Architecture Principles are a deliverable that is produced by the architect and defines the general rules and guidelines for the architecture work. They reflect the business principles, business goals, and business drivers of the organization. The Architecture Requirements Specification is a deliverable that is produced by the architect and defines the requirements that govern the architecture work. It covers both functional and non-functional requirements as well as constraints and assumptions.

Gap Analysis is a technique that compares the Baseline Architecture and the Target Architecture to identify the differences and gaps between them. The purpose of this technique is to determine the changes and additions that are required to achieve the desired future state of the architecture. One of the main aspects of Gap Analysis is to identify the functions that are missing or overlapping in the current and future architectures, and to plan how to address them. This helps to ensure that the architecture is complete, consistent, and aligned with the business objectives and requirements3

The planning horizon, depth, and breadth of an Architecture Project, along with the contents of the EA Repository, are typically framed by Strategy, Portfolio,Segment, and End-to-end Target Architecture. The
'Segment' refers to a part of the organization, typically addressed in a Segment Architecture, while 'End-to-end Target Architecture' encompasses the complete view of the planned architecture across the entire organization.