What are the four dimensions used to scope an architecture?

In the TOGAF Architecture Development Method (ADM), specifically during Phase A (Architecture Vision), scoping the architecture effort is a critical step to ensure the project is manageable and delivers value. The TOGAF Standard defines four specific dimensions used to limit and define the scope of an architecture engagement: Breadth (the enterprise scope or extent of the organization involved), Depth (the level of detail required), Time Period (the time horizon for the architecture), and Architecture Domains (which of the Business, Data, Application, and Technology domains are covered).

A: These represent the four architecture domains, which constitute only one of the four required scoping dimensions. B: These are business architecture concepts and planning levels, not the standard TOGAF dimensions for scoping an architecture engagement. D: These represent levels of the architecture landscape and planning horizons, not the four specific dimensions used for scoping.

1. The Open Group. (2022). The TOGAF® Standard, 10th Edition - Architecture Development Method. Phase A: Architecture Vision, Section 4.3.4 (Define Scope).

2. The Open Group. (2022). The TOGAF® Standard, 10th Edition - Introduction and Core Concepts. Section 4.15 (Scoping the Architecture).