What foundational document outlines the values of Agile software development?

The Agile Manifesto is the foundational document that outlines the core values and principles of Agile software development. Created in 2001 by a group of software developers, the manifesto emphasizes four key values: individuals and interactions over processes and tools, working software over comprehensive documentation, customer collaboration over contract negotiation, and responding to change over following a plan. These values serve as guiding principles for Agile methodologies, encouraging flexibility, collaboration, and a focus on delivering functional software that meets customer needs.

In contrast, while the Scrum Guide provides specific frameworks and practices within Agile processes, and Lean Principles focuses on efficiency and reduction of waste, neither of these documents establish the overarching values of Agile as the Agile Manifesto does. The Software Development Lifecycle, on the other hand, describes the various phases involved in software development but does not specifically address the values or principles of Agile practices. Thus, the Agile Manifesto stands out as the critical source that defines the foundational values of Agile development.