I was trying to get the diagramming working with RDocs, and it said that I needed dot >version 1.86 so I installed the latest (2.12) and it still says the same thing. After Install I did 'which dot' and it says /usr/local/bin/dot , so I know it's there. Do I need to specify anything other than -d on the command line to get it to graph the class diagrams? Matt