Now that the amount of scientific knowledge has become so large that a single individual cannot hope to encompass more than a fraction of it in the course of a lifetime, the problem of order and economy in learning and the transmission of knowledge becomes of overwhelming importance. A restructuring of knowledge (rather than a unification of knowledge) becomes necessary because of the growth of knowledge itself. The nature of the restructuring which is taking place, and which will have to take place, will be determined by the minimum knowledge (not the maximum) which must be transmitted from generation to generation if the whole knowledge structure is not to disintegrate.