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When developing a Business Architecture, TOGAF provides guidance on how to leverage existing architecture descriptions to build a comprehensive and accurate Baseline Description. Here’s a step-by-step explanation:

Existing Architecture Descriptions:

Existing architecture descriptions provide valuable insights into the current state of the enterprise’s architecture. These descriptions can include documentation of processes, systems, technologies, and organizational structures.

Baseline Description:

The Baseline Description represents the current state of the enterprise architecture. It serves as the starting point for developing the Target Architecture and planning the transition from the current state to the future state.

Using Existing Descriptions:

Review and Analyze: Existing architecture descriptions should be reviewed and analyzed to understand the current state accurately. This involves identifying all relevant artifacts, documents, and data.

Integration into Baseline: The information from the existing descriptions should be integrated into the Baseline Description. This ensures that the Baseline accurately reflects the current state, providing a solid foundation for future planning.

Gaps and Opportunities: By using existing descriptions, architects can identify gaps in the current architecture and opportunities for improvement. This helps in formulating a more effective Target Architecture.

TOGAF ADM References:

Phase A: Architecture Vision: This phase involves establishing the architecture vision, which includes defining the scope and approach for the Baseline Description.

Phase B: Business Architecture: During this phase, the Baseline Business Architecture is developed using existing architecture descriptions as a key input.

In summary, using existing architecture descriptions as the basis for the Baseline Description ensures that the current state is accurately documented, providing a reliable foundation for developing the Target Architecture and planning the transition.

In the context of TOGAF and Business Architecture, the diagram depicts the relationship between a Value Stream, Value Stage, and Value.

Value Stream: Represents the end-to-end set of activities that create and deliver value to a stakeholder.

Value Stage: A distinct step or phase within the Value Stream.

Value: The benefit delivered to the stakeholder.

The relationship "X" indicates that a Value Stream is composed of multiple Value Stages.

Think of it like a journey (Value Stream) with multiple stops along the way (Value Stages). Each stage contributes to the overall value delivered at the end of the journey.