Which of the ADM phases includes the objective of establishing the organizational model for enterprise architecture?

The choice of the Preliminary phase as the correct answer is appropriate because this phase lays the foundational groundwork for the entire Architecture Development Method (ADM). During the Preliminary phase, organizations focus on defining the scope, establishing the architecture framework, and creating the governance model that is necessary for the successful development and implementation of enterprise architecture.

A key element of this phase is the establishment of the organizational model for enterprise architecture, which includes the identification of stakeholders, the roles and responsibilities of various teams, and the architectural governance structure. This is crucial as it sets the tone for how architecture initiatives will be managed throughout the enterprise.

In contrast, the other phases, such as Phase A, Phase B, and Phase D, have different focuses primarily on the development of specific aspects of the architecture and preparing for implementation rather than organizational modeling. Phase A is about defining the architecture vision, Phase B focuses on business architecture, and Phase D is concerned with technology architecture. Therefore, while these phases contribute to the overall architecture process, they do not specifically aim at establishing the organizational model for enterprise architecture.