Thomas Kuhn Quotes

41 Sourced Quotes

Normal science, the activity in which most scientists inevitably spend most 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. As a puzzle-solving activity, normal science does not aim at novelties of fact or theory and, when successful, finds none.

Thomas Kuhn
Under normal conditions the research scientist is not an innovator but a solver of puzzles, and the puzzles upon which he concentrates are just those which he believes can be both stated and solved within the existing scientific tradition.

Thomas Kuhn
Later scientific theories are better than earlier ones for solving puzzles in the often quite different environments to which they are applied. That is not a relativist's position, and it displays the sense in which I am a convinced believer in scientific progress.

Thomas Kuhn
The practice of normal science depends on the ability, acquired from exemplars, to group objects and situations into similarity sets which are primitive in the sense that the grouping is done without an answer to the question, "similar with respect to what?"

Thomas Kuhn
Rather than being an interpreter, the scientist who embraces a new paradigm is like the man wearing inverting lenses.

Thomas Kuhn
No part of the aim of normal science is to call forth new sorts of phenomena; indeed those that will not fit the box are often not seen at all. Nor do scientists normally aim to invent new theories, and they are often intolerant of those invented by others.

Thomas Kuhn
Research under a paradigm must be a particularly effective way of inducing paradigm change.

Thomas Kuhn
Does a field make progress because it is a science, or is it a science because it makes progress?

Thomas Kuhn
What a man sees depends both upon what he looks at and also upon what his previous visual-conceptual experience has taught him to see.

Thomas Kuhn
Literally as well as metaphorically, the man accustomed to inverting lenses has undergone a revolutionary transformation of vision.

Thomas Kuhn
All crises begin with the blurring of a paradigm and the consequent loosening of the rules for normal research... Or finally, the case that will most concern us here, a crisis may end with the emergence of a new candidate for paradigm and with the ensuing battle over its acceptance.

Thomas Kuhn
Probably, the single most prevalent claim advanced by the proponents of a new paradigm is that they can solve the problems that led the old one to a crisis..

Thomas Kuhn
Each paradigm will be shown to satisfy more or less the criteria that it dictates for itself and to fall short of a few of those dictated by its opponent.

Thomas Kuhn
The man who is striving to solve a problem defined by existing knowledge and technique is not, however, just looking around. He knows what he wants to achieve, and he designs his instruments and directs his thoughts accordingly. Unanticipated novelty, the new discovery, can emerge only to the extent that his anticipations about nature and his instruments prove wrong... There is no other effective way in which discoveries might be generated.

Thomas Kuhn
Communication across the revolutionary divide is inevitably partial.

Thomas Kuhn
The scientific enterprise as a whole does from time to time prove useful, open up new territory, display order, and test long-accepted belief. Nevertheless, the individual engaged on a normal research problem is almost never doing any one of these things. Once engaged, his motivation is of a rather different sort. What then challenges him is the conviction that, if only he is skillful enough, he will succeed in solving a puzzle that no one before has solved or solved so well.

Thomas Kuhn
A paradigm is what members of the scientific community share, and, conversely a scientific community consists of men who share a paradigm.

Thomas Kuhn
Philosophers of science have repeatedly demonstrated that more than one theoretical construction can always be placed upon a given collection of data.

Thomas Kuhn
It is, I think, particularly in periods of acknowledged crisis that scientists have turned to philosophical analysis as a device for unlocking the riddles of their field. Scientists have not generally needed or wanted to be philosophers.

Thomas Kuhn
Scientists work from models acquired through education and through subsequent exposure to the literature often without quite knowing or needing to know what characteristics have given these models the status of community paradigms

Thomas Kuhn