The purpose of this paper is primarily theoretical -- to propose and detail a model of system evolution, and show its derivation from the fields of Enterprise Architecture, cybernetics and systems theory. Cybernetic thinking is used to develop a 'Co-evolution Path Model' to explain how enterprises co-evolve with their environments. The model is re-interpreting Stafford Beer's Viable System Model, and also uses Conant and Ashby's theorem of the 'good regulator', exemplifying how various complexity management theories could be synthesised into a cybernetic theory of Enterprise Architecture -- informing management of mechanisms to maintain harmony between the evolution of the enterprise as a system and the evolution of its environment.
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