Thomas Kuhn: Quotes about science

“In science, as in the playing card experiment, novelty emerges only with difficulty, manifested by resistance, against a background provided by expectation.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), VI. Anomaly and the Emergence of Scientific Discoveries, p. 64 (2012 ed.)

Science

“Men whose research is based on shared paradigms are committed to the same rules and standards for scientific practice. That commitment and the apparent consensus it produces are prerequisites for normal science, i. e., for the genesis and continuation of a particular research tradition.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), II. The Route to Normal Science, p. 11 (2012 ed.)

Men , Science

“"Normal science" means research firmly based upon one or more past scientific achievements, achievements that some particular scientific community acknowledges for a time as supplying the foundation for its further practice”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), II. The Route to Normal Science, p. 10

Communication , Science , Time , Past

“To my complete surprise, that exposure to out-of-date scientific theory and practice radically undermined some of my basic conceptions about the nature of science and the reasons for its special success.
Those conceptions were ones I had previously drawn partly from scientific training itself and partly from a long-standing avocational interest in the philosophy of science. Somehow, whatever their pedagogic utility and their abstract plausibility, those notions did not at all fit the enterprise that historical study displayed. Yet they were and are fundamental to many discussions of science, and their failures of verisimilitude therefore seemed thoroughly worth pursuing. The result was a drastic shift in my career plans, a shift from physics to history of science and then, gradually, from relatively straightforward historical problems back to the more philosophical concerns that had initially led me to history.”

Thomas Kuhn book The Structure of Scientific Revolutions

The Structure of Scientific Revolutions (1962), Preface

History , Failure , Nature , Problem

“History, if viewed as a repository for more than anecdote or chronology, could produce a decisive transformation in the image of science by which we are now possessed.”

Thomas Kuhn book The Structure of Scientific Revolutions

The Structure of Scientific Revolutions (1962), I. Introduction: A Role of History

History , Decision , Science

“Ever since prehistoric antiquity one field of study after another has crossed the divide between what the historian might call its prehistory as a science and its history proper. These transitions to maturity have seldom been so sudden or so unequivocal as my necessarily schematic discussion may have implied. But neither have they been historically gradual, coextensive, that is to say, with the entire development of the fields within which they occurred.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), II. The Route to Normal Science, p. 22 (2012 ed.)

History , Study , Science

“Philosophers of science have repeatedly demonstrated that more than one theoretical construction can always be placed upon a given collection of data. History of science indicates that, particularly in the early developmental stages of a new paradigm, it is not even very difficult to invent such alternates. But that invention of alternates is just what scientists seldom undertake except during the pre-paradigm stage of their science’s development and at very special occasions during its subsequent evolution. So long as the tools a paradigm supplies continue to prove capable of solving the problems it defines, science moves fastest and penetrates most deeply through confident employment of those tools. The reason is clear. As in manufacture so in science—retooling is an extravagance to be reserved for the occasion that demands it. The significance of crises is the indication they provide that an occasion for retooling has arrived.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), VII. Crisis and the Emergence of Scientific Theories, p. 76 (2012 ed.)

Confidence , History , Problem , Science

“Few people who are not actually practitioners of a mature science realize how much mop-up work of this sort a paradigm leaves to be done or quite how fascinating such work can prove in the execution.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), III. The Nature of Normal Science, p. 24 (2012 ed.)

People , Science

“Normal science, the activity in which most scientists inevitably spend almost all their time, is predicated on the assumption that the scientific community knows what the world is like. Normal science often suppresses fundamental novelties because they are necessarily subversive of its basic commitments.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), I. Introduction: A Role of History, p. 5

World , Communication , Science , Time

“Normal science, the puzzle-solving activity we have just examined, is a highly cumulative enterprise, eminently successful in its aim, the steady extension of the scope and precision of scientific knowledge. In all these respects it fits with great precision the most usual image of scientific work. Yet one standard product of the scientific enterprise is missing. Normal science does not aim at novelties of fact or theory and, when successful, finds none.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), VI. Anomaly and the Emergence of Scientific Discoveries, p. 52

Knowledge , Science , Success

“These three classes of problems—determination of significant fact, matching of facts with theory, and articulation of theory—exhaust, I think, the literature of normal science, both empirical and theoretical. They do not, of course, quite exhaust the entire literature of science. There are also extraordinary problems, and it may well be their resolution that makes the scientific enterprise as a whole so particularly worthwhile. But extraordinary problems are not to be had for the asking. They emerge only on special occasions prepared by the advance of normal research.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), III. The Nature of Normal Science, p. 34 (2012 ed.)

Literature , Problem , Thinking , Science

“In the development of any science, the first received paradigm is usually felt to account quite successfully for most of the observations and experiments easily accessible to that science’s practitioners. Further development, therefore, ordinarily calls for the construction of elaborate equipment, the development of an esoteric vocabulary and skills, and a refinement of concepts that increasingly lessens their resemblance to their usual common-sense prototypes. That professionalization leads, on the one hand, to an immense restriction of the scientist’s vision and to a considerable resistance to paradigm change. The science has become increasingly rigid. On the other hand, within those areas to which the paradigm directs the attention of the group, normal science leads to a detail of information and to a precision of the observation-theory match that could be achieved in no other way.”

Thomas Kuhn book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), VI. Anomaly and the Emergence of Scientific Discoveries, p. 64 (2012 ed.)

Way , Sense , Science , Change

“If a demarcation criterion exists (we must not, I think, seek a sharp or decisive one), it may lie just in that part of science which Sir Karl ignores.”

Thomas Kuhn

"Logic of Discovery or Psychology of Research?", Criticism and the growth of knowledge edited by Imre Lakatos and Alan Musgrave (1970)

Lie , Thinking , Decision , Science