"Complex interactive models can be constructed and adjusted to produce any desired result. Without verification they reflect only the ideas on which they are based. The famed mathematical physicist and father of cybernetics, John von Neumann, once said: "If you allow me four free parameters I can build a mathematical model that describes exactly everything that an elephant can do. If you allow me a fifth free parameter, the model I build will forecast that the elephant will fly." - Dr Walter Starck LINK