What is the key difference between Phase G and Phase H in TOGAF?

The distinction between Phase G and Phase H in TOGAF is primarily centered around the nature of their respective focus regarding the implementation and management of architectural solutions.

Phase G, often referred to as "Architecture Change Management," is crucial in ensuring that the implementation of architecture conforms to the defined target architecture. It involves monitoring the implementation process and making necessary adjustments to maintain alignment with the overall architecture vision and framework. This phase plays a significant role in addressing how the architecture can evolve over time through controlled changes.

Conversely, Phase H, known as "Architecture Governance," emphasizes the management of ongoing changes to the architecture post-implementation. This phase is more about ensuring that modifications to the architecture and related processes continue to align with business goals and objectives and that they adhere to established standards, principles, and methodologies. It involves governance activities that support decision-making and provide oversight for ongoing architecture efforts.

Thus, the correct option accurately captures the essence of how Phase G concentrates on confirming that implementations meet the architecture's goals while Phase H is tasked with managing the evolution and governance of architecture as changes are introduced and the organization grows.