A must-read follow-up to The Structure of Scientific Revolutions, one of the most important books of the twentieth century. This book contains the text of Thomas S. Kuhn’s unfinished book, The Plurality of Worlds: An Evolutionary Theory of Scientific Development, which Kuhn himself described as a return to the central claims of The Structure of Scientific Revolutions and the problems that it raised but did not resolve. The Plurality of Worlds is preceded by two related texts that Kuhn publicly delivered but never published in English: his paper “Scientific Knowledge as Historical Product” and his Shearman Memorial Lectures, “The Presence of Past Science.” An introduction by the editor describes the origins and structure of The Plurality of Worlds and sheds light on its central philosophical problems. Kuhn’s aims in his last writings are bold. He sets out to develop an empirically grounded theory of meaning that would allow him to make sense of both the possibility of historical understanding and the inevitability of incommensurability between past and present science. In his view, incommensurability is fully compatible with a robust notion of the real world that science investigates, the rationality of scientific change, and the idea that scientific development is progressive.

Divided into three parts, this work is a record of the direction Kuhn was taking during the last two decades of his life. It consists of essays in which he refines the basic concepts set forth in "Structure"--Paradigm shifts, incommensurability, and the nature of scientific progress.

Thomas Kuhn's The Structure of Scientific Revolutions is one of the best-known and most influential books of the twentieth century. But were Kuhn's ideas as revolutionary as the conventional wisdom holds? Steve Fuller argues that Kuhn advocated what was actually a profoundly conservative view of science and how one ought to study its history - a view Fuller charges helped usher in the Science Wars and stifle much innovative research.

"A masterly assessment of the way the idea of quanta of radiation became part of 20th-century physics. . . . The book not only deals with a topic of importance and interest to all scientists, but is also a polished literary work, described (accurately) by one of its original reviewers as a scientific detective story."—John Gribbin, New Scientist "Every scientist should have this book."—Paul Davies, New Scientist

Thomas S. Kuhn’s The Structure of Scientific Revolutions was a watershed event when it was published in 1962, upending the previous understanding of science as a slow, logical accumulation of facts and introducing, with the concept of the “paradigm shift,” social and psychological considerations into the heart of the scientific process. More than fifty years after its publication, Kuhn’s work continues to influence thinkers in a wide range of fields, including scientists, historians, and sociologists. It is clear that The Structure of Scientific Revolutions itself marks no less of a paradigm shift than those it describes. In Kuhn’s “Structure of Scientific Revolutions” at Fifty, leading social scientists and philosophers explore the origins of Kuhn’s masterwork and its legacy fifty years on. These essays exhume important historical context for Kuhn’s work, critically analyzing its foundations in twentieth-century science, politics, and Kuhn’s own intellectual biography: his experiences as a physics graduate student, his close relationship with psychologists before and after the publication of Structure, and the Cold War framework of terms such as “world view” and “paradigm.”

Thomas Kuhn’s The Structure of Scientific Revolutions is one of the most important books of the twentieth century. Its influence reaches far beyond the philosophy of science, and its key terms, such as “paradigm shift,” “normal science,” and “incommensurability,” are now used in both academic and public discourse without any reference to Kuhn. However, Kuhn’s philosophy is still often misunderstood and underappreciated. In Kuhn’s Legacy, Bojana Mladenović offers a novel analysis of Kuhn’s central philosophical project, focusing on his writings after Structure. Mladenović argues that Kuhn’s historicism was always coupled with a firm and consistent antirelativism but that it was only in his mature writings that Kuhn began to systematically develop an original account of scientific rationality. She reconstructs this account, arguing that Kuhn sees the rationality of science as a form of collective rationality. At the purely formal level, Kuhn’s conception of scientific rationality prohibits obviously irrational beliefs and choices and requires reason-responsiveness as well as the uninterrupted pursuit of inquiry. At the substantive, historicized level, it rests on a distinctly pragmatist mode of justification compatible with a notion of contingent but robust scientific progress. Mladenović argues that Kuhn’s epistemology and his metaphilosophy both represent a creative and fruitful continuation of the tradition of American pragmatism. Kuhn’s Legacy demonstrates the vitality of Kuhn’s philosophical project and its importance for the study of the philosophy and history of science today.