Unbounded rationality

The paper discusses bounded and unbounded rationality in purposeful complex adaptive systems (PCAS) modeled by the Evolutionary Systems Design (ESD) f ramework. Due to Herbert Simon, bounded rationality is the rationality of c ognition. Unbounded rationality is the generalized rationality of connected ness represented mathematically, of spirituality, and of right decision/neg otiation. Operational procedures for defining/solving and validating a prob lem in group decision and negotiation under unbounded rationality are discu ssed. With human PCAS as a focus, the paper more generally considers ration ality in multiagent systems with natural and/or artificial agents.