This volume presents an attempt to construct a unified cognitive theory of science in relatively short compass. It confronts the strong program in sociology of science and the positions of various postpositivist philosophers of science, developing significant alternatives to each in a reeadily comprehensible sytle. It draws loosely on recent developments in cognitive science, without burdening the argument with detailed results from that source. . . . The book is thus a provocative one. Perhaps that is a measure of its value: it will lead scholars and serious student from a number of science studies disciplines into continued and sharpened debate over fundamental questions.&;Richard Burian, Isis \"The writing is delightfully clear and accessible. On balance, few books advance our subject as well.\"&;Paul Teller, Philosophy of Science