 Communication can be seen as a form of cooperation, and here as in the case of the emergence of cooperation the methods of (communicative) strategy change seem less important than the interactive structure in which those strategies play out. Computer simulations show that simple imitation of a neighbor’s successful strategy, various forms of reinforcement learning, and training up of simple neural nets on successful neighbors’ behaviors can all result in the emergence and spread of signaling systems, sometimes with different dialects (Zollman 2005; Grim, St. Denis &amp; Kokalis 2002; Grim, Kokalis, Alai-Tafti, Kilb &amp; St. Denis, 2004).[9]  Development on a cellular automata grid produces communication with any of these techniques, even when the rewards are one-sided rather than mutual in a strict Lewis signaling game, but structures of interaction that facilitate communication can also co-evolve with the communication they facilitate as well (Skyrms 2010). Elliot Wagner extends the study of communication on interaction structures to other networks as well (Wagner 2009).