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One of the major challenges in the provision of distributed systems is the accomodation of evolutionary change. This may involve modifications or extensions to the system which were not envisaged at design time. Furthermore, in many application domains there is a requirement that the system accomodate such change dynamically, without stopping or disturbing(More)
M ost consumer electronics today contain embedded software. In the early days, developing CE software presented relatively minor challenges, but in the past several years three significant problems have become apparent: • The size and complexity of the software in individual products are increasing rapidly. Embedded software roughly follows Moore's law,(More)
There is a real need for clear and sound design speciica-tions of distributed systems at the architectural level. This is the level of the design which deals with the high-level organisation of computational elements and the interactions between those elements. The paper presents the Darwin notation for specifying this high-level organisation. Darwin is in(More)
Self-management is put forward as one of the means by which we could provide systems that are scalable, support dynamic composition and rigorous analysis, and are flexible and robust in the presence of change. In this paper, we focus on architectural approaches to self-management, not because the language-level or network-level approaches are uninteresting(More)
The goal of this roadmap paper is to summarize the state-of-the-art and to identify critical challenges for the systematic software engineering of self-adaptive systems. The paper is partitioned into four parts, one for each of the identified essential views of self-adaptation: modelling dimensions, requirements, engineering, and assurances. For each view,(More)
Model checking is an automated technique for verifying that a system satisfies a set of required properties. Such properties are typically expressed as temporal logic formulas, in which atomic propositions are predicates over state variables of the system. In event-based system descriptions, states are not characterized by state variables, but rather by the(More)
Much of the recent work on Architecture Description Languages (ADL) has concentrated on specifying organisations of components and connectors which are static. When the ADL specification is used to drive system construction, then the structure of the resulting system in terms of its component instances and their interconnection is fixed. This paper examines(More)
In this paper we discuss a model-based approach to verifying web service compositions for web service implementations. The approach supports verification against specification models and assigns semantics to the behavior of implementation models so as to confirm expected results for both the designer and implementer. Specifications of the design are modeled(More)