The methotodology of the Memory Evolutive Systems (developed with Jean-Paul Vanbremeersch), proposes a categorical model for multi-level, multi-agent, self-organized sytems, such as living cognitive systems. In particular it studies decision making problems, both at the local level of a specific 'co-regulator' agent, and at the 'global' level of the interplay between the different co-regulators. Cf. our book : "Memory Evolutive Systems: hierarchy, emergence, cognition" (Elsevier 2007) and more recent papers on my site http://ehres.pagesperso-orange.fr Andree Ehresmann [For admin and other information see: http://www.mta.ca/~cat-dist/ ]