I am a firm believer that TDD is an outdated standalone practice. After years and years of practicing and learning TDD, there is a revolution going on towards BDD, Behavior Driven Design, that encompasses TDD and builds upon those principles and practices. In this session, we will look at how BDD improves on the concepts of TDD, helps write better tests and makes you think more thoroughly through the problem you are attempting to solve. We will be replacing what you know about fixtures and tests with concepts such as contexts and specifications, concerns and observations and how to organize your specifications and use specunit to introduce better language into your tests and build specification reports. We do all of this in C# and Visual Studio 2008.