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Introductory Essay.- 1. Otto Neurath and the Neurath Reception: Puzzle and Promise.- I. The Case of Neurath and the History and Historiography of Science and Philosophy.- 2. On Otto Neurath.- 3. History and the System of Science in Otto Neurath.- 4. On the Historiography of Austrian Philosophy.- 5. Aspects of the Social Background and Position of the Vienna Circle at the University of Vienna.- II. Neurath as a Metatheoretician: Epistemology and Methodology.- 6. The Philosopher Otto Neurath.- The Early Neurath.- 7. The First Vienna Circle.- 8. On Neurath's Writings on Logic, Ethics and Physics.- 9. The Neurath Principle: Its Grounds and Consequences.- Neurath and the Vienna Circle.- 10. Metaphysics in the Vienna Circle.- 11. Ethics and the Problem of Value in the Vienna Circle.- 12. Otto Neurath--Moritz Schlick: On the Philosophical and Political Antagonisms in the Vienna Circle.- 13. Neurath contra Schlick. On the Discussion of Truth in the Vienna Circle.- 14. On Neurath's Empiricism and his Critique of Empiricism.- 15. Two Ways of Experiential Justification.- Applications.- 16 Otto Neurath's Contribution to the Theory of the Social Sciences.- 17. Sociological Thought with Otto Neurath.- 18. Neurath's Theory of Pictorial-Statistical Representation.- III. Neurath as Politician of Knowledge: The Partisanship of Enlightenment.- 19. Otto Neurath: Encyclopedist, Adult Educationalist and School Reformer.- 20. Otto Neurath and Adult Education: Unity of Science, Materialism and Comprehensive Enlightenment.- 21. The Unity of Planned Economy and the Unity of Science.- 22. Otto Neurath's Utopias--The Will to Hope.- Name Index.