YAGNI (You Aren’t Gonna Need It) is a fundamental principle of agile software development that encourages developers to avoid adding functionality until it is necessary. By adhering to YAGNI, teams can maintain a lean codebase, reduce complexity, and focus on delivering features that provide immediate value to the user. This principle is particularly useful in iterative development environments where requirements can change rapidly, and maintaining flexibility is crucial. Within the methods-and-patterns quadrant, YAGNI is a foundational practice, promoting efficient workflow and resource use. It is recommended for adoption as it aligns with the modern emphasis on agility and responsiveness in software development. Implementing YAGNI can help organizations avoid over-engineering and concentrate efforts on current needs, ensuring that development remains focused and productive.