Source Code is the design. It always bugs me when we're asked to write huge documents that become obsolete as soon as coding begins. This doesn't mean one shouldn't document. On the contrary one should document to the extent it gets the information across. The 'actual' design will always be represented by code. The design is 100% reflected as code.

What Is Software Design: 13 Years Later by Jack W. Reeves - developer.*, Developer Dot Star: "In software development, the design document is a source code listing."