TOGAF 9.1 Summary of the classification model for Architecture Landscapes

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Levels provide a framework for dividing the Architecture Landscape into three levels of granularity:

Strategic Architecture provides an organizing framework for operational and change activity and allows for direction setting at an executive level.

Segment Architecture provides an organizing framework for operational and change activity and allows for direction setting and the development of effective architecture roadmaps at a program or portfolio level.

Capability Architecture provides an organizing framework for change activity and the development of effective architecture roadmaps realizing capability increments.

The following characteristics are typically used to organize the Architecture Landscape:

Breadth: The breadth (subject matter) area is generally the primary organizing characteristic for describing an Architecture Landscape. Architectures are functionally decomposed into a hierarchy of specific subject areas or segments.

Depth: With broader subject areas, less detail is needed to ensure that the architecture has a manageable size and complexity. More specific subject matter areas will generally permit (and require) more detailed architectures.

Time: For a specific breadth and depth an enterprise can create a Baseline Architecture and a set of Target Architectures that stretch into the future. Broader and less detailed architectures will generally be valid for longer periods of time and can provide a vision for the enterprise that stretches further into the future.

Recency: Finally, each architecture view will progress through a development cycle where it increases in accuracy until finally approved. After approval, an architecture will begin to decrease in accuracy if not actively maintained. In some cases recency may be used as an organizing factor for historic architectures.

Using the criteria above, architectures can be grouped into Strategic, Segment, and Capability
Architecture levels,

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