Which phase of the ADM focuses on defining architecture vision and scope?

Phase A of the Architecture Development Method (ADM) in TOGAF is dedicated to establishing the architecture vision and scope. During this phase, the fundamental goals and objectives of the architecture project are set, which involve understanding the business context and identifying the key stakeholders.

The architecture vision developed during this phase serves as a high-level overview that outlines how the architectural work aligns with the business goals. This vision helps to ensure that all stakeholders have a shared understanding and commitment to what the architecture will achieve. It includes considerations around the overall scope of the architecture effort, which means determining the areas that the architecture will address, the boundaries of the work, and the required responsibilities.

As this phase is foundational, it sets the stage for the subsequent phases of the ADM, which delve deeper into the specifics of the architecture — such as business architecture, information systems architecture, and technology architecture. Having a solid vision and scope ensures coherence and direction for the entire architecture development process.