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There is a solution to this kind of problem in the viable system model — Beer emphasises it in his later work, particularly in the parts of the second edition of Brain of the Firm that were written after his experience in Chile. A truly viable system needs to have communication channels that link the operations to higher-level management functions and even to higher levels of recursion. Stafford Beer called these ‘algedonic signals’ — a kind of neurological metaphor, coined from the Greek words for pain and pleasure.

It might be easier, though, to understanding them as the kind of messages sent by the red handle in a train driver’s cab. As well as a physical check on the individual vehicle, the emergency brake sends an organisational message to the whole railway, informing it that a piece of track can’t be used.