This talk by LPS professor Jeff Barrett will consider how simple cue-reading, sensory-manipulation, and signaling games may evolve from ritualized decisions and how more complex games may evolve from simpler games by polymerization, template transfer, and modular composition. Modular composition is a process that combines simpler games into more complex games. Template transfer, a process by which a game is appropriated to a context other than the one in which it initially evolved, is one mechanism for modular composition. And polymerization is a particularly salient example of modular composition where simpler games evolve to form more complex chains. Barrett will also consider how the evolution of new capacities by modular composition may be more efficient than evolving those capacities from basic decisions.