Briefly, Information Theory is getting real world phenomena to behave like symbols, while Cybernetics is getting symbols to behave like real world phenomena.<p>If you want to solve a math problem, then a computer plus a proper algorithm will suffice.  If you want to design a system that interacts with its environment and can achieve goals while maintaining homoeostasis, the name for that is Cybernetics.<p>&quot;Introduction to Cybernetics&quot; by Ashby has been made freely available in PDF form by his estate.  A great and noble service for which I commend them.
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