Which of the ADM phases commences with receipt of a Request for Architecture Work from the sponsor?

Phase A of the Architecture Development Method (ADM) is where the process begins with the receipt of a Request for Architecture Work from the project's sponsor. This phase is critical as it sets the foundation for the entire architecture development cycle. During Phase A, the scope of the architecture work is defined, and stakeholders are identified, ensuring that all relevant parties are involved in the architecture development process.

At this stage, the architect begins to understand the business context and needs, which helps in creating a framework for what the architecture will deliver. Establishing this foundational understanding is crucial before proceeding to subsequent phases, where detailed architecture development occurs. Thus, the initiation of work based on the sponsor's request accurately characterizes Phase A in the ADM.