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This paper presents an original approach to the development of models, methods and techniques for increasing reliability, availability, safety and security of large scale distributed systems, particularly Grids and Web-based distributed systems. The characteristics of these systems pose problems to ensuring dependability, especially because of the geographical distribution of resources and users, volatility of resources that are available only for limited amounts of time, and constraints imposed by the applications and resource owners. The problems of ensuring dependability represents a hot research subject today and, despite the fact that many projects obtained valuable results in this domain, no acceptable solution was yet found that could integrate all the requirements for designing a dependable system and that could exploit all the capabilities of modern systems.
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