Explanation
https://pubs.opengroup.org/architecture/togaf8-doc/arch/chap03.html
The chart that you have provided is a Gantt chart that shows the tasks and timelines of a TOGAF project. It illustrates the concept of phased development of an Enterprise Architecture, which is one of the key principles of the TOGAF Architecture Development Method (ADM). The ADM is a cyclic process that consists of nine phases, from Preliminary to Architecture Change Management1. Each phase has a specific purpose, scope, inputs, steps, and outputs, and produces a part of the Enterprise Architecture. The phases are executed in a sequential order, with some iterations and feedback loops, to ensure that the architecture is consistent, complete, and aligned with the business requirements and objectives. The phases also have a limited fixed duration, which is determined by the complexity, scope, and resources of the project. This helps to manage the expectations, risks, and costs of the architecture development, and to deliver the architecture in a timely and effective manner23.