Source · TOGAF Standard, 10th Edition — ADM: Phase D
Why this matters
ADM — Phase DPhase D develops the Technology Architecture — the infrastructure that hosts and runs the applications and data from Phase C. It's the last of the three domain phases; after it, you have a complete target architecture ready to plan for delivery.
The concept
Phase D §ObjectivesPhase D develops the Target Technology Architecture enabling the Architecture Vision, the business services, and the Information Systems, and analyses gaps vs the baseline. It maps application components to technology components and platform services.
Artifacts & the TRM
Phase D §StepsKey artifacts: Technology Standards catalog, Technology Portfolio catalog, Environments & Locations diagram, Platform Decomposition diagram. TOGAF's Technical Reference Model (TRM) is a foundation architecture that can be used as a starting point for the Technology Architecture.
How it connects
ADM flowPhase D completes the B→C→D domain sequence. Its gaps consolidate with B and C and flow to Phase E (Opportunities & Solutions), where all gaps become work packages. Technology is the T in BDAT (TGF‑C1).
- Phase D is the last domain phase (B→C→D); after it the target architecture is complete.
- The TRM (Technical Reference Model) is a foundation starting point — don't confuse it with the III‑RM (integrated information infrastructure).
- Phase D is about platform/infrastructure services, not application logic (that's C).
- Phase D develops the Target Technology Architecture + gap analysis.
- It hosts the Phase C applications/data; completes the B→C→D sequence.
- The TRM can seed the Technology Architecture; gaps flow to Phase E.