The goal of this workshop is to contribute to the formulation of an NSF research agenda and program on "the science of design" that may subsequently appear as an Request For Proposals in early 2004. To this end, our workshop will help identify and cultivate concepts, techniques, experiences, empirical evidence, or tools that somehow play a role in the ongoing design or redesign of open source software systems (executable code), artifacts (documents, source code comments, design diagrams, build scripts, release schedules, Web pages, chat messages, etc.), processes, portals, and communities. We are using reference to the notion that OSS may be designed through an ongoing evolutionary, adaptive, and/or reactive processes/practices, rather than one where design follows from and seeks to fulfill clearly articulated (and documented) requirements, as is advocated in mainstream software engineering.