Which architecture domain is the first architecture activity undertaken in the ADM cycle?

In the context of The Open Group Architecture Framework (TOGAF) and its Architecture Development Method (ADM) cycle, the first architecture activity undertaken is in the Business Architecture domain. This stage focuses on understanding the overarching organizational goals, business processes, and stakeholder requirements that drive the architecture initiative.

The Business Architecture serves as the foundation for the subsequent architectural domains (Application, Data, and Technology). By defining the business context first, you ensure that the architectural efforts align with the strategic objectives of the organization. This alignment is critical as it helps in shaping the designs and decisions made in the later phases of the ADM cycle, ensuring that all architectural work is relevant and supports the business needs.

Addressing the other domains first would not provide the necessary context and guidance for effectively addressing the requirements in the Application, Data, and Technology domains. Therefore, establishing a strong foundation in Business Architecture is essential for successful architecture development.