MIT Computer ASSISTed Design Demo
Technorati is reporting [1] 300 or so links to this video on YouTube. In YouTube fashion, the video is uncredited. A digging session eventually found an original of the video at the MIT Computer Science and Artificial Inteligence Laboratory's Design Rationale's publication page. The original [mpg format, 29 Mbyte] video, circa 2003, is done using a Mimio/whiteboard; the current system enables a more natural sketching style and operates on either a whiteboard and a tablet computer. (The video title mentions the Oxygen program.)
The demonstration is interesting - both for the overall flow of the design process as well as the literal mindedness of the simulation. The front wheel of the cart is sloppily drawn, with an acentric axel, so it wobbles as it rolls down the inclined plane. [1] Technorati search for YouTube video "MIT Sketching" (3DNZNTgglPbUA) http://www.technorati.com/search/http%3A%2F%2Fyoutube.com%2Fwatch%3Fv%3DNZNTgglPbUA