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[[Image:Emergence.gif|left|Weak Emergence]] The CAS Group is a community for people interested in the science and theory of [[Complex_Adaptive_System|complex adaptive systems]] (CAS), and in their [[Basic_System_Theory|basic principles]] and [[Applied_System_Theory|applied principles]]. CASs are perhaps the most interesting complex systems, they are not only 'complex' - they are diverse and made up of multiple interconnected elements - and 'adaptive' - they have also the capacity to change and learn from experience. The logo describes the phenomenon of [[Emergence|emergence]], as it can be observed for example in swarms and flocks. Like [[Self-Organization|self-organization]] it is a essential principle in the theory of complex adaptive systems.