This new edition of Kuhn's work in the history of science includes an introduction by Ian Hacking, which clarifies terms popularized by Kuhn, including paradigm and incommensurability, and applies Kuhn's ideas to the science of today. Keyed to the separate sections of the book, Hacking's introduction provides important background information as well as a contemporary context. Newly designed, with an expanded index.

"50th anniversary edition"--Cover.

The route to normal science --The nature of normal science -- Normal science as puzzle-solving -- The priority of paradigms -- Anomaly and the emergence of scientific discoveries -- Crisis and the emergence of scientific theories -- The response to crisis -- The nature and necessity of scientific revolutions -- Revolutions as changes of world view -- The invisibility of revolutions -- The resolution of revolutions -- Progress through revolutions.