In which phase of the ADM cycle do building blocks become implementation-specific?

Phase A, Architecture Vision, focuses on defining the scope and vision of the architecture, not implementation-specific details.

Phase B, Business Architecture, defines the target business architecture, focusing on business capabilities and processes, not technical implementation.

Phase C, Information Systems Architecture (Data and Application Architectures), defines the logical application and data architectures, which are still relatively generic compared to implementation-specific solutions.

Phase D, Technology Architecture, defines the target technology architecture, which is still at an architectural level and not yet implementation-specific.

In TOGAF's Architecture Development Method (ADM), Phase E, Opportunities & Solutions, focuses on identifying and selecting the architectural components and solutions that address the architectural requirements, where generic architecture building blocks are refined into implementation-specific building blocks (ABBs become SBBs) suitable for procurement or development. This phase bridges the gap between the target architecture and the actual implementation, making solution choices specific.