This book is a Festschrift dedicated to Gabriele Kern-Isberner on the occasion of her 60th birthday. It contains contributions by her students, colleagues and friends. The articles, written by computer scientists, mathematicians, philosophers and psychologists, address recent research in areas such as rationality and non-monotonic reasoning, problem solving and query answering, belief revision, uncertain reasoning, and argumentation.

The IfColog Journal of Logics and their Applications covers all areas of pure and applied logic, broadly construed. This Journal is open access, and available in both printed and electronic formats. It is published by College Publications, on behalf of IfCoLoG (www.ifcolog.net).