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Complexity & robust control theory

  Stability
  We like clever algorithms   more reliable, less intervention
  Performance increases with complexity   Just-in-time delivery, Credit card theft detection, Derivatives trading
  Complexity improves handling of special cases

  Robustness
  How well do you handle the unexpected?
  Complexity always decreases robustness
  Well-meaning algorithms might make problems worse!

  Tradeoff
  The bigger they are, the harder they fall
  You can never win