The REX School/Symposium "A Decade of Concurrency - Reflections and Perspectives" was the final event of a ten-year period of cooperation between three Dutch research groups working on the foundations of concurrency.
Ever since its inception in 1983, the goal of the project has been to contribute to the cross-fertilization between formal methods from the fields of syntax, semantics, and proof theory, aimed at an improved understanding of the nature of parallel computing. The material presented in this volume was prepared by the lecturers (and their coauthors) after the meeting took place.
In total, the volume constitutes a thorough state-of-the-art report of the research activities in concurrency.

Researchers working on the semantics of programming languages came together in The Netherlands in June 1992 for a workshop on Semantics - Foundations and Applications. This volume is based on the meeting and contains material prepared by the lecturers after the meeting took place. The volume includes papers on a wide range of topics in both foundationsand applications, including: - Comparative domain theory, category theory, information systems, - Concurrency: process algebras, asynchronous communication, action semantics, trace nets, process refinement, concurrent constraint programming, - Predicate transformers, refinement, weakest preconditions, - Comparative semantics of programming concepts, full abstraction, - Reasoning about programs: total correctness, epistemic logic, - Logic programming, - Functional programming: sequentiality, integration with concurrency, applied structured operational semantics. The workshop was an activity of the project REX (Research andEducation in Concurrent Systems) sponsored by the Netherlands NFI (NationaleFaciliteit Informatica) Programme.

In the past decade, the formal theory of specification, verfication and development of real-time programs has grown from work of a few specialized groups to a real "bandwagon." Many eminent research groups have shifted their interests in this direction. Consequently, research in real-time is now entering established research areas in formal methods, such as process algebra, temporal logic, and model checking. This volume contains the proceedings of a workshop dedicated to the theory of real-time with the purpose of stepping back and viewing the results achieved as well as considering the directions of ongoing research. The volume gives a representative picture of what is going on in the field worldwide, presented by eminent, active researchers. The material in the volume was prepared by the authors after the workshop took place and reflects the results of the workshop discussions.

Over the last few years, object-oriented programming has been recognized as the best way currently available of structuring software systems. It emphasizes grouping together data and the operations performed on them, encapsulating the whole behind a clean interface, and organizing the resulting entities in a hierarchy based on specialization in functionality. In this way it provides excellent support for the construction of large systems. Up to now, there has been relatively little effort to develop formal theories of object-oriented programming. However, for the field to mature, a more formal understanding of the basic concepts of object-oriented programming is necessary. This volume presents the proceedings of the School/Workshop on Foundations of Object-Oriented Programming (FOOL) held in Noordwijkerhout, The Netherlands, May 28 - June 1, 1990. The workshop was an activity of the project REX (Research and Education in Concurrent Systems).

Control Flow Semantics presents a unified, formal treatment of the semantics of a wide spectrum of control flow notions as found in sequential, concurrent, logic, object-oriented, and functional programming languages.Control Flow Semantics presents a unified, formal treatment of the semantics of a wide spectrum of control flow notions as found in sequential, concurrent, logic, object-oriented, and functional programming languages. Whereas in more traditional approaches one focuses on input/output behavior, in this work equal attention is devoted to finite and infinite computations, the latter motivated by the growing importance of reactive systems. Knowledge of the comparative semantics of control structures is critical for the designers of programming languages, and it is difficult to choose from today's bewildering variety of control flow concepts (the ways in which a program specifies the successive steps to be taken during execution). Encyclopedic in scope, Control Flow Semantics provides comprehensive coverage of these concepts, developing operational and denotational models for control flow in 27 languages. In all cases, precise statements are given relating these models. A rich body of semantic definitional techniques is presented, including (labeled) transition systems, higher-order definitions, resumptions and continuations, linear or sequence-based models, and models specified by domain equations. Moreover, both symbol-based or schematic languages-prevalent in the study of concurrency-and state-based or interpreted languages are considered. The book is founded on a unifying mathematical basis of metric structures, allowing the full modeling of infinite behavior, as well as the exploitation of some classical results, such as Banach's fixed point theorem. Perspectives on further topics, such as full abstractness, noninterleaving semantics for parallelism, and second-order programming are also included. Foundations of Computing series

This collection of current research on logic programming languages presents results from a three-year, ESPRIT-funded effort to explore the integration of the foundational issues of functional, logic, and object-oriented programming. It offers valuable insights into the fast-developing extensions of logic programming with functions, constraints, concurrency, and objects. Chapters are grouped according to the unifying themes of functional programming, constraint, logic programming, and object-oriented programming.