When development teams are in the same room, it is not surprising to see diagrams being used – if only being shared via sketches made on pads, or through the use of whiteboards. Interestingly, despite the fact that OSS teams are distributed geographically, diagrams also play an important role in OSS development.
There was a helpful research done by Koji Yatani et al. at University of Toronto and Oregon State University. They studied developers on the Ubuntu project and found that developers create and distribute digitalized diagrams as opposed to physical sketches. While the uses of diagrams are specific to the Ubuntu projects, there are definitely lessons that we can learn to apply in other OSS projects to ensure successful development.