This book constitutes the refereed proceeding of the 6th International Conference on Coordination Models and Languages, COORDINATION 2004, held in Pisa, Italy in February 2004. The 20 revised full papers presented together with the abstracts of 3 invited talks were carefully reviewed and selected from 72 submissions. Among the topics addressed are context-aware coordination, the Linda coordination model, component adaptation, aspect-oriented programming, coordination middleware, peer-to-peer systems, coordination languages, network coordination, logic based coordination, agent coordination, as well as several coordination tools.

We welcome you to Coordination ’99, the third in a series of conferences d- icated to an important perspective on the development of complex software systems. That perspective is shared by a growing community of researchers - terested in models, languages, and implementation techniques for coordination. The last decade has seen the emergence of a class of models and languages variously termed “coordination languages”, “con?guration languages”, “arc- tectural description languages”, and “agent-oriented programming languages”. Theseformalismsprovideacleanseparationbetweenindividualsoftwarecom- nents and their interaction within the overall software organization. This se- ration makes complex applications more tractable, supports global analysis,and enhances the reuse of software components. The proceedings of the previous two conferences on this topic were published by Springer as Lecture Notes in Computer Science 1061 and 1282. This issue of LNCS containing the papers presented at Coordination ’99 continues the tradition of carefully selected and high quality papers representing the state of the artin coordinationtechnology.In responseto thecallfor papers,wereceived 67 submissions, from which 26 papers were accepted. These proceedings also contain abstracts for posters presented at the conference. This year’s program features invited talks by Rocco De Nicola and Danny B. Lange. Reading through the papers, we expect that you may be surprised by the variety of disciplines within computer science that have embraced the notion of coordination. In fact, we expect this trend to continue, and hope that you will contribute to the on-going exploration of its strengths, weaknesses, and applications.

This volume contains the proceedings of the Fifth International Conference on Coordination Models and Languages (Coordination 2002), held in York, UK, 8–11 April 2002. Coordination models and languages close the conceptual gap - tween the cooperation model used by the constituent parts of an application and the lower-level communication model used in its implementation. Coordinati- based methods provide a clean separation between individual software com- nents and their interactions within their overall software organization. This se- ration, together with the higher-level abstractions o?ered by coordination models and languages, improve software productivity, enhance maintainability, advocate modularity, promote reusability, and lead to software organizations and arc- tectures that are more tractable and more amenable to veri?cation and global analysis. Coordination is relevant in design, development, debugging, maintenance, and reuse of all complex concurrent and distributed systems. Speci?cally, - ordination becomes paramount in the context of open systems, systems with mobile entities, and dynamically re-con?gurable evolving systems. Moreover, - ordination models and languages focus on such key issues in Component Based Software Engineering as speci?cation, interaction, and dynamic composition of components.

This book constitutes the refereed proceedings of the 4th International Conference on Coordination Languages and Models, COORDINATION 2000, held in Limassol, Cyprus in September 2000. The 18 revised full papers and nine short papers presented were carefully reviewed and selected from 52 submissions. The papers are organized in topical sections on coordination styles and trends, tuple space semantics and implementation, coordination policies, dynamics of coordination, mobility, semantic models, shifting Linda perspectives, directions in software architecture, achieving software dependability.

This volume contains the Proceedings of the Fourth International Conference on Coordination Models and Languages, Coordination 2000. It was held in the wake of three successful earlier conferences whose proceedings were also p- lished in this series, in volumes 1061, 1282 and 1594. The need for increased programmer productivity and rapid development of complex systems provides pragmatic motivation for the development of coordination languages and m- els. The intellectual excitement associated with such endeavors is rooted in the decades-old desire to cope with increasingly higher levels of abstraction. Coordination-based methods provide a clean separation between individual so- ware components and their interactions within the overall software organization. This separation promises to make application development more tractable, to support global analysis, and to enhance software reuse. These are indeed major concerns in the information age, at a time when all aspects of society are relying, to an ever increasing degree, on software systems of unprecedented complexity. Research on coordination methods is likely to play a central role in addressing these technological concerns by changing the software culture around us and by leading to the development of e?ective technical solutions for a broad range of important problems.