Imre Lakatos (1922-1974): Philosopher of Mathematics and Philosopher of Science.- The Lakatosian Revolution.- Immediate Perception.- On Imre Lakatos.- Lakatos One and Lakatos Two: An ppreciation.- William Whewell and the Concept of Scientific Revolution.- How Can One Testimony Corroborate Another?.- Constraints on Science.- Research Programs, Rationality, and Ethics.- Introduction: Culture, Cultural System and Science.- On the Critique of Scientific Reason.- The Young Einstein and The Old Einstein.- An Ethic of Cognition.- Instrumentalism and Its Critique: A Reappraisal.- Imre Lakatos: Some Recollections.- Is Falsifiability the Touchstone of Scientific Rationality? Karl Popper versus Inductivism.- Ancient Geometrical Analysis and Modern Logic.- The Development of Logical Probability.- Descartes' Rules of Impact and Their Criticism. An Example of the Structure of Processes in the History of Science.- Toulmin and the Rationality of Science.- Participation, 'Authenticity' and the Contemporary Vision of Man, Law and Society.- Rational Reconstructions.- A Paradox for the Birds.- Mathematics as a Critical Enterprise.- The Fertility of Theory and the Unit for Appraisal in Science.- The Ambivalence of Scientists.- Method or Madness?.- Novel Predictions as a Criterion of Merit.- Whither Physical Objects?.- Popperian Philosophy of Science as an Antidote Against Relativism.- Conditions of Progress and the Comparability of Theories.- Comments on Two Epistemological Theses of Thomas Kuhn.- Leibniz's Program for the Development of Logic.- On Compton's Research Program.- Inquiring Systems and Paradigms.- History, Praxis and the Third World'. Ambiguities in Lakatos' Theory of Methodology.- Against Some Methods.- The Human Condition: Two Criticisms of Hobbes.- TheRelation Between Philosophy of Science and History of Science.- Cosmology and Logic - An Intractable Issue?.- Index of Names.