Information technology has been, in recent years, under increasing commercial pressure to provide devices and systems which help/ replace the human in his daily activity. This pressure requires the use of logic as the underlying foundational workhorse of the area. New logics were developed as the need arose and new foci and balance has evolved within logic itself. One aspect of these new trends in logic is the rising impor­ tance of model based reasoning. Logics have become more and more tailored to applications and their reasoning has become more and more application dependent. In fact, some years ago, I myself coined the phrase "direct deductive reasoning in application areas", advocating the methodology of model-based reasoning in the strongest possible terms. Certainly my discipline of Labelled Deductive Systems allows to bring "pieces" of the application areas as "labels" into the logic. I therefore heartily welcome this important book to Volume 25 of the Applied Logic Series and see it as an important contribution in our overall coverage of applied logic.

Logical Aspects of Model-Based Reasoning.- A Case Study of the Design and Implementation of Heterogeneous Reasoning Systems.- A Logical Approach to the Analysis of Metaphors.- Ampliative Adaptive Logics and the Foundation of Logic-Based Approaches to Abduction.- Diagrammatic Inference and Graphical Proof.- A Logical Analysis of Graphical Consistency Proofs.- Adaptive Logics for Non-Explanatory and Explanatory Diagnostic Reasoning.- Model-Guided Proof Planning.- Degrees of Abductive Boldness.- Scientific Explanation and Modified Semantic Tableaux.- Computational Aspects of Model-Based Reasoning.- Computational Discovery of Communicable Knowledge.- Encoding and Using Domain Knowledge on Population Dynamics for Equation Discovery.- Reasoning about Models of Nonlinear Systems.- Model-Based Diagnosis of Dynamic Systems: Systematic Conflict Generation.- Modeling Through Human-Computer Interactions and Mathematical Discourse.- Combining Strategy and Sub-models for the Objectified Communication of Research Programs.- Author Index.