May We Identify Reduction and Explanation of Theories ?.- Restriction and Embedding.- Anomalies of Reduction.- Ontological Reduction in the Natural Sciences.- Explanation of Theories and the Problem of Progress in Physics.- Reduction, Interpretation and Invariance.- Reduction and Evolution Arguments and Examples.- Limiting Case Correspondence between Physical Theories.- Contact Structures, Predifferentiability and Approximation.- Tangent Embedding A Special Kind of Approximate Reduction.- A Logical Investigation of the Phlogiston Case.- Utilistic Reduction in Sociology: The Case of Collective Goods.- Intertheory Relations in Growth Economics: Sraffa and Wicksell.- Possible Approaches to Reduction in Economic Theory.- Why Language ?.- On the Comparison of Classical and Special Relativistic Space-Time.- Space-Time Geometries for One-Dimensional Space.- Quantum Theory as a Factualization of Classical Theory.- Classical and Non Classical Limiting Cases of Quantum Logic.- Bells Inequalities and the Reduction of Statistical Theories.- Name Index.