The aim ... is to provide a clear and rigorous basis for determining when a causal ordering can be said to hold between two variables or groups of variables in a model . . . . The concepts refer to a model-a system of equations-and not to the 'real' world the model purports to describe.
Herbert SimonMost of what we do to get people ready to act in situations of encounter consists of drilling these lists into them suf๏ฌciently deeply so that they will be evoked quickly at the time of the decision.
Herbert Simon