The Transition Between Competing Paradigms Cannot Be

Research Under A Paradigm Must Be A Particularly Effective Way Of Inducing Paradigm Change.

Individuals Who Break Through By Inventing A New Paradigm Are Almost Always Either Very Young Men Or Very New To The Field Whose Paradigm They Change. These Are The Men Who, Being Little Committed By Prior Practice To The Traditional Rules Of Normal Science, Are Particularly Likely To See That Those Rules No Longer Define A Playable Game And Conceive Another Set That Can Replace Them.

Concerned To Reconstruct Past Ideas, Historians Must Approach The Generation That Held Them As The Anthropologist Approaches An Alien Culture. They Must, That Is, Be Prepared At The Start To Find That Natives Speak A Different Language And Map Experience Into Different Categories From Those They Themselves Bring From Home. And They Must Take As Their Object The Discovery Of Those Categories And The Assimilation Of The Corresponding Language.

Rather Than Being An Interpreter, The Scientist Who Embraces A New Paradigm Is Like The Man Wearing Inverting Lenses.

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.