<P>Preface; <EM>John Symons</EM>.- Introduction; <EM>Olga Pombo and Juan Torres</EM>.- Part 1 - Neurath.- Unity of Science and Logical Empiricism; <EM>Otto Neurath</EM>.- The Neurath-Horkeimer-Controversy Reconsidered. Otto Neurath's <EM>Erwiderung</EM> to Max Horkeimer's Attack against the Vienna Circle; <EM>Karlheinz Barck</EM>.- Otto Neurath's Epistemology and Its Paradoxes; <EM>Jan Sebestik</EM>.- Neurath and the Encyclopaedic Project of the Unity of Science; <EM>Olga Pombo</EM>.- Principles and Practices of Neurath's Language; <EM>Ahti-Veikko Pietarinen</EM>.- Conceptions of Reality - Schlick, Carnap, Neurath; <EM>Thomas Bonk</EM>.- Keeping Track of Neurath's Bill: Abstract Concepts, Stock Models and the Unity of Classical Physics; <EM>Sheldon Steed, Gabriele Contessa and Nancy Cartwright</EM>.- G. Itelson - A Socratic Philosopher; <EM>Gideon Freudenthal and Tatiana Karachentsev</EM>.- Part 2 – Unity.- Unity without Myths; <EM>Daniel Andler</EM>.- Two Unification Strategies: Analysis or Reduction, and Synthesis or Integration; <EM>Mario Bunge</EM>.- A Comprehensible World; <EM>Robert L. Causey</EM>.- Unified Science? Does Scientific Progress Necessarily Lead to a Unified Science?; <EM>C. Ulises Moulines</EM>.- The Achilles' Heel of the Program for the Unity of Science; <EM>Juan Manuel Torres</EM>.- Scientific Reasonableness and the Pragmatic Approach to the Unity of Science; <EM>Andrés Rivadulla</EM>.- Naturalism and the Unity of Science; <EM>Jan Wolenski</EM>.- Searching the Unity of Science: From Classical Logic to Abductive Logical Systems; <EM>Angel Nepomuceno, Fernando Soler, Atocha Aliseda</EM>.- Direct Abduction through Dual Resolution; <EM>Fernando Soler, Angel Nepomuceno</EM>.- Index.</P>