a few other free systems. In the years that followed, a team including Flatt, Robby Findler, Shriram Krishnamurthi, Cormac Flanagan, and many others produced DrScheme, a programming environment for novice Scheme programmers and a research environment for gradual typing. The main development language that DrScheme supported was named PLT Scheme.

In parallel, the team began conducting workshops for high school