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The ECOOP '91 Workshop on Object-Based Concurrent Computing was organized toprovide a forum on concurrent, distributed and open-ended computing. The emphasis was on conceptual, theoretical and formal aspects, as well as practical aspects and sound experience, since such a viewpoint was deemed indispensible to investigate and establish a basis for future development. This volume contains 12 papers selected from 25 presented at the workshop, together with a paper by J.A. Goguen, who was an invited speaker at the workshop. The papers are classified into four categories: Formal methods (1): three papers are concerned with the formal semantics of concurrent objects based on process calculi. Formal methods (2): four papers are concerned with various formal approaches to the semantics of concurrent programs. Concurrent programming: three papers. Models: three papers areconcerned with models for concurrent systems.

Object-Based Concurrent Computing: ECOOP '91 Workshop, Geneva, Switzerland, July 15-16, 1991. Proceedings

Towards an object calculus.- On asynchronous communication semantics.- A unifying framework for process calculus semantics of concurrent object-oriented languages.- A sheaf semantics for FOOPS expressions (extended abstract).- Semantic layers of object-based concurrent computing.- Formal techniques for parallel object-oriented languages.- Trace semantics for actor systems.- Dynamic programming as multiagent programming.- Scheduling predicates.- A concurrency control mechanism for C++ objects.- Object-Oriented Concurrent Reflective architectures.- Abstract description of distributed object systems.- Design issues for object-based concurrency.- Panel: What is an object?.