Hiyall, I am currently extending RSTTool to allow vertical layout of RST, along the lines of SSA. For an example of that, see and exmaple from Lars Huttar: http://www.cs.oberlin.edu/students/huttar/ssa-chart.jpg Has anyone any diagrams of pure RST layed out in this manner? Could you send them to me, or pointers to diagrams. Mick