This collection of 38 papers gives a cross-section of ongoing research in philosophy of science and philosophical logic. The papers, written by active researchers in the field and published here for the first time, are drawn from around 650 papers that were contributed to the 9th International Congress of Logic, Methodology and Philosophy of Science in Uppsala, Sweden, 1991. Some of the speakers whose contributions attracted special interest were invited to contribute their papers to this volume. A few papers appear here more or less as they were presented at the Congress, whereas others are expansions or elaborations of the talks given.There is one section with five papers on philosophical logic. The other papers deal with many different aspects of philosophy of science, including general methodological questions, problems of probability, induction and decision theory, and ethics of science and technology, as well as foundational problems about particular sciences. Five special sections are concerned with logic, mathematics and computer science, the physical sciences, the biological sciences, cognitive science, and linguistics, respectively. Finally, there is one section on the history of logic, methodology and philosophy of science.The book will be of interest to philosophers of science and logicians, as well as to all researchers interested in the foundations of their disciplines.