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The Sigma Profile: A Formal Tool to Study Organization and its Evolution at Multiple Scales

The $σ$ profile is presented as a tool to analyze the organization of systems at different scales, and how this organization changes in time. Describing structures at different scales as goal-oriented agents, one can define $σ\in [0,1]$ ("satisfaction") as the degree to which the goals of each agent at each scale have been met. $σ$ reflects the organization degree at that scale. The $σ$ profile of a system shows the satisfaction at different scales, with the possibility to study their dependencies and evolution. It can also be used to extend game theoretic models. A general tendency on the evolution of complexity and cooperation naturally follows from the $σ$ profile. Experiments on a virtual ecosystem are used as illustration.