The chart shown is a Gantt chart, which is commonly used for project management to illustrate a project schedule. In the context of TOGAF (The Open Group Architecture Framework), which is a framework for enterprise architecture, this Gantt chart is demonstrating the sequenced approach to the Architecture Development Method (ADM). The ADM is the core process of TOGAF which provides a tested and repeatable process for developing architectures. The ADM is described as being iterative, over the whole process, between phases, and within phases. For each iteration of the ADM, a fresh decision must be taken about each of the parameters (scope, granularity, time period, and architecture assets).
The ADM consists of a number of phases that have to be followed in sequence:
Preliminary Phase: Framework and principles
Phase A: Architecture Vision
Phase B: Business Architecture
Phase C: Information Systems Architectures, including Data and Application Architectures Phase D: Technology Architecture Phase E: Opportunities and Solutions Phase F: Migration Planning Phase G: Implementation Governance Phase H: Architecture Change Management Requirements Management Each phase is dependent on the outputs of the previous phase and the Requirements Management phase runs throughout. The Gantt chart clearly shows the dependency and sequence in which these phases occur, implying that a structured approach is followed to produce the enterprise architecture.
The TOGAF Standard, Version 9.2, a standard of The Open Group
The TOGAF documentation available at https://publications.opengroup.org/standards/architecture and
https://publications.opengroup.org/guides/architecture