`One of the most important documents of the twentieth century.' - Sir Peter Medawar, New Scientist`One cannot help feeling that, if it had been translated as soon as it had been originally published, philosophy in this country might have been saved some detours. Professor Popper's thesis has that quality of greatness that, once seen, it appears simple and almost obvious' - Times Literary Supplement

• PART I Introduction to the Logic of Science 1 A Survey of Some Fundamental Problems 2 On the Problem of a Theory of Scientific Method PART II Some Structural Components of a Theory of Experience 3 Theories 4 Falsifiability 5 The Problem of the Empirical Basis 6 Degrees of Testability 7 Simplicity 41 Elimination of the Aesthetic and the Pragmatic Concepts of Simplicity 8 Probability 9 Some Observations on Quantum Theory 10 Corroboration, or How a Theory Stands up to Tests