In the TOGAF ADM, the Preliminary Phase sets up the architecture capability within the organization, establishing architecture governance, defining architecture principles, and setting up necessary processes and tools. This phase is crucial for laying the foundation before formal architecture development begins.
References: TOGAF ADM Preliminary Phase.
The Preliminary Phase is the first phase in the TOGAF Architecture Development Method (ADM). It sets the foundation for successful architecture development within an organization. The primary purpose of this phase is to:
* Establish an Enterprise Architecture practice:This involves defining the organizational structure, processes, and resources needed to support architecture activities.
* Tailor TOGAF to the organization's needs:TOGAF is a flexible framework. The Preliminary Phase allows for adapting the ADM and other TOGAF components to fit the specific context and requirements of the organization.
* Secure senior management commitment:Gaining support from leadership is crucial for the success of any enterprise architecture initiative. This phase helps to ensure that key stakeholders understand and endorse the architecture development process.
* Define the scope and approach:This includes determining the initial scope of the architecture work, identifying relevant architecture domains, and selecting appropriate methods and tools

Architecture Principles establish consistent guidelines for developing and governing enterprise architecture. They support informed decision-making, promote alignment with business objectives, and ensure architectural consistency across projects and initiatives.

In the TOGAF ADM, the Preliminary Phase sets up the architecture capability within the organization, establishing architecture governance, defining architecture principles, and setting up necessary processes and tools. This phase is crucial for laying the foundation before formal architecture development begins.
Reference:
The Preliminary Phase is the first phase in the TOGAF Architecture Development Method (ADM). It sets the foundation for successful architecture development within an organization. The primary purpose of this phase is to:
Establish an Enterprise Architecture practice: This involves defining the organizational structure, processes, and resources needed to support architecture activities.
Tailor TOGAF to the organization's needs: TOGAF is a flexible framework. The Preliminary Phase allows for adapting the ADM and other TOGAF components to fit the specific context and requirements of the organization.
Secure senior management commitment: Gaining support from leadership is crucial for the success of any enterprise architecture initiative. This phase helps to ensure that key stakeholders understand and endorse the architecture development process.
Define the scope and approach: This includes determining the initial scope of the architecture work, identifying relevant architecture domains, and selecting appropriate methods and tools

The graphic illustrates a method for developing alternative target architectures in Phase E of the TOGAF ADM1. The method involves identifying and evaluating candidate architectures based on criteria such as business value, cost, risk, and feasibility1. The method helps to identify the most suitable architecture solution for the enterprise.
The graphic illustrates a method that supports the TOGAF ADM by identifying and evaluating alternative target architectures. The process begins with a vision, influenced by principles and requirements, leading to the consideration of alternatives. Each alternative is assessed based on different criteria, leading to the selection of the most suitable target architecture. This is consistent with the TOGAF approach of developing a set of potential architectures and then selecting the one that best meets the enterprise's needs.