What is the first phase of the TOGAF Architecture Development Method (ADM)?

The first phase of the TOGAF Architecture Development Method (ADM) is the Preliminary phase. This phase sets the foundation for all other phases of the ADM by establishing the architecture framework and tailoring it to the organization's needs. During the Preliminary phase, key activities include defining the architecture principles that will guide the architecture work, obtaining executive sponsorship, and understanding the enterprise's architecture capability.

Establishing this foundational work is critical as it ensures that subsequent phases, such as Architecture Vision and Architecture Definition, are aligned with the overall goals and contexts of the organization. The Preliminary phase also addresses the necessary governance structures and roles that will be required throughout the architecture development process, thereby ensuring that the organization is well-prepared to undertake the architecture project effectively.