During normal periods of its development, science attempts to force nature into the conceptual framework which is supplied by professional education on the basis of the fundamental commitments accepted by scientists as a group. In a period of scientific revolution, one or more scientists feels that certain generally accepted paradigms are either inadequate in regard to the phenomena they claim to explain or at least unable to solve all the problems which can legitimately be asked. The scientific community is then forced to face such anomalies which in turn leads to a crisis situation in that science. In such a crisis situation extraordinary investigations begin that lead the scientific community to the elaboration of a new set of basic commitments, to a new paradigm or set of paradigms which then constitute a new basis for the practice of science.