Any attempt to reduce the complex properties of biological organisms or of nervous systems or of human brains to simple physical and chemical systems… - Kenneth E. Boulding

A second possible approach to general systems theory is through the arrangement of theoretical systems and constructs in a hierarchy of complexity, roughly corresponding to the complexity of the "individuals" of the various empirical fields... leading towards a "system of systems."… I suggest below a possible arrangement of "levels" of theoretical discourse.

It is clear that the building of models is not a purely mechanical process but requires skill of a high order – not merely mathematical skill but a sensitivity to the relative importance of different factors and a critical, almost an artistic, faculty in the selection of behaviour equations which are reasonable, tentative hypotheses in explaining the behaviour of actual economies.

Economists and technologists bring the "bits", but it requires the social scientists and humanists to bring the "wits."