Abstract: How much of the design of a system changes during implementation? When these inevitable changes occur the design must evolve to meet the new requirements. If it is truly inevitable then an interesting question can be posed? Instead of spending a large amount of time upfront on the design can you put in place a series of practices to enable the design to evolve during the implementation? This session highlights the various practices of Evolutionary Design (i.e. Test-Driven Development, Refactoring, Simple Design, and Continuous Integration) and how these practices work together to allow the design to evolve as requirements change.