Compiled for the inquiring reader who wants to know more about the increasing number of theories referred to daily in newspapers, magazines and on TV and radio programs, the "Dictionary of Theories" is the first multi-disciplinary reference book to bring together theories, laws, hypotheses, principles, rules, theorems, 'ologies and 'isms from all subject areas. Organized alphabetically, coverage extends from the arts to economics, history, linguistics, philosophy, psychology, sociology and on through the hard sciences. Ancient and modern, accepted and discredited, all theories which have relevance in today's world are included. The depth of the terms varies from undergraduate level to the more populist, with theories such as Parkinson's Law and the Peter Principle included.