The Handbook of Deontic Logic and Normative Systems presents a detailed overview of the main lines of research on contemporary deontic logic and related topics. Although building on decades of previous work in the field, it is the first collection to take into account the significant changes in the landscape of deontic logic that have occurred in the past twenty years. These changes have resulted largely, though not entirely, from the interaction of deontic logic with a variety of other fields, including computer science, legal theory, organizational theory, economics, and linguistics. This first volume of the Handbook is divided into three parts, containing nine chapters in all, each written by leading experts in the field. The first part concentrates on historical foundations. The second examines topics of central interest in contemporary deontic logic. The third presents some new logical frameworks that have now become part of the mainstream literature. A second volume of the Handbook is currently in preparation, and there may be a third after that.

This volume presents the refereed proceedings of the 12th International Conference on Deontic Logic and Normative Systems, DEON 2014, held in Ghent, Belgium, in July 2014. The 17 revised papers and the 2 invited papers included in this volume were carefully reviewed and selected from 31 submissions. Topics covered include challenges from natural language for deontic logic; the relationship between deontic and other types of modality: epistemic modality, imperatives, supererogatory, etc.; the deontic paradoxes; the modeling of normative concepts other than obligation and permission, e.g., values; the game-theoretical aspects of deontic reasoning; the emergence of norms; norms from a conversational and pragmatic point of view; and norms and argumentation.

"Logic and law have a long history in common, but the influence has been mostly one-sided, except perhaps in the 5th and 6th centuries B.C., where disputes at the market place or in tribunals in Greece seem to have stimulated a lot of reflection among sophistic philosophers on such topics as language and truth. Most of the time it was logic that influenced legal thinking, but in the last 50 years logicians began to be interested in normative concepts and hence in law"--

In consequence of an increased interest in problems relating to human action, normative concepts have been much discussed by philosophers and logicians in the past twenty years. Deontic logic, which deals with the normative use of language and such normative concepts as obligation, prohibition and permission, has become one of the most intensively cultivated areas of formal logic. Important investigations have been carried out which have shed considerable light on various aspects of the normative phenomenon and a great number of different systems of deontic logic have been developed. This progressive proliferation of deontic logics not only shows the great interest of logicians in normative discourse, but also reflects a basic perplexity: the lack of suitable criteria of adequacy for the interpretation of deontic calculi and hence difficulty in decid ing which of the systems provides the best reconstruction of the underlying normative concepts and can therefore be applied with the most fruitful results. This difficulty is so great that some authors have even expressed doubts about the practical usefulness of deontic logic. One of the sources of this perplexity lies in the absence of a well established pre-analytical basis for formal studies. It is sometimes even uncertain what the intuitive notions are that deontic logicians intend to reconstruct. In talking about obligations, prohibitions and permissions, they usually have in mind moral norms. But the choice of moral norm as an explicandum for the construction of a logic of norms has several disadvantages.

Deontic logic deals with obligation, permission and related normative concepts. This textbook introduces three frameworks that have dominated the landscape of deontic logic: monadic deontic logic, dyadic deontic logic, and input/output logic. It describes their language, semantics, proof theory, and gives soundness and completeness theorems. The addition of exercises makes the book ideal for self-study or as a textbook in class. Deontic logic remains neutral on application issues. Over the years, it has been applied in a variety of fields, including philosophy, ethics, linguistics, computer science, and the law. This textbook will serve as a valuable resource for students and researchers wishing to gain a practical understanding of deontic logic for use in their work.

A useful logic in which to specify normative system behaviour, deontic logic has a broad spectrum of possible applications within the field: from legal expert systems to natural language processing, database integrity to electronic contracting and the specification of fault-tolerant software.