“Overall, then, we will view cas [complex adaptive systems] as systems composed of interacting agents described in terms of rules. These agents adapt by changing their rules as experience accumulates. In cas, a major part of the environment of any given adaptive agent consists of other adaptive agents, so that a portion of any agent's efforts at adaptation is spent adapting to other adaptive agents. This one feature is a major source of the complex temporal patterns that cas generate. To understand cas we must understand these ever-changing patterns.”