In which ADM phase is the goal to ensure that the architecture achieves its original target business value?

Phase E: Opportunities and Solutions focuses on identifying and specifying delivery vehicles for the architecture, not on ensuring post-implementation business value achievement.

Phase F: Migration Planning concentrates on creating a detailed plan for migrating from the baseline to the target architecture, which is prior to the actual realization and monitoring of business value.

Phase G: Implementation Governance is about overseeing the implementation of the architecture, ensuring conformance, but Phase H is specifically for ongoing value realization and change management after implementation.

Phase H: Architecture Change Management is the phase focused on ensuring that the deployed architecture continues to meet business needs and achieve its original target business value throughout its lifecycle. This involves monitoring the architecture for changes, managing architectural evolution, and ensuring the architecture remains relevant and effective in delivering promised benefits.

The Preliminary Phase establishes the architecture capability and context, which precedes any architecture development or value realization activities.