The last thirty years have seen the development of powerful new tools for architects and planners: CAD, 3D modelling, digital imaging, geographic information systems, and real time animated walkthroughs. That is just the beginning. Based on our experience with CAD tools, analysis of design practice, and an understanding of computer hardware and software, weire out to invent the next generation of tools. We think architects should be shakers and makers, not just consumers, of computer aided design. We started the Sundance Lab (for Computing in Design and Planning) in 1993 with a few people and machines. Weive grown to more than a dozen people (mostly undergraduate students) and a diverse interdisciplinary array of projects. Weive worked with architects and planners, anthropologists, civil engineers, geographers, computer scientists, and electrical engineers. Our work is about the built environment: its physical form and various information involved in making and inhabiting places. We cover a wide range of topics - from design information management to virtual space, from sketch recognition to design rationale capture, to communication between designer and computer. All start from the position that design is a knowledge based and information rich activity. Explicit representations of design information (knowledge, rationale, and rules) enables us to engage in more intelligent dialogues about design. The following describes some of our projects under various rubrics.