This document discusses Test Driven Development (TDD) and how it can be used with the Groovy programming language. It introduces TDD principles like writing tests first, then code to pass the tests, and refactoring. Groovy features like dynamic typing, closures, and its Meta Object Protocol (MOP) make it well-suited for TDD. The document includes a Groovy code example and provides resources for learning more about TDD with Groovy.