"In my own field of many-body physics, we are, perhaps, closer to our fundamental, intensive underpinnings than in any other science in which non-trivial complexities occur, and as a result we have begun to formulate a general theory of just how this shift from quantitative to qualitative differentation takes place. This formulation called the theory of "broken symmetry," may be of help in making more generally clear the breakdown of the constructive converse of reductionism."