Hi Liviu, Good luck on your defense! I would very much appreciate seeing your work on coevolution. My particular application is evolving players for the card game Mille Bornes. At first I worked with one subpop, but of course that didn't really work because the system would simply get stuck in a local minimum where it would win against itself half the time. Sure it solved the problem, but it wasn't quite what I was looking for. So instead I'm working with eight subpops, hoping that each will develop a different strategy to defend against the other seven. We'll see what happens :) Thanks for the references -- I'll definitely check them out. Yours, --Rob