The Historian Of Science May

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.

Its Assimilation Requires The Reconstruction Of Prior Theory And Re-evaluation Of Prior Fact, An Intrinsically Revolutionary Process That Is Seldom Completed A Single Man And Never Overnight

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.

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

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.