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Non-functional properties (NFPs) concern various characteristics of a system (cost, power, QoS). These characteristics belong to different models of the system, built by different design teams, using different formalisms. Therefore, the design of a system includes a number of domain-specific modeling languages, used to express various NFPs. This paper focuses on the heterogeneity of the points of view on the system. We show that ˵multi-view″ approaches which do not rely on a unique underlying model appear better-suited to express NFPs than model weaving or annotations. However, existing approaches in this category do not yet support model execution. We introduce a multi-view extension to ModHel΄X, a framework for executing heterogeneous models, and we show how it can be used for modeling non-functional characteristics of a system and expressing NFPs. A key point of this approach is that it relies only on the core concepts of ModHel΄X, but uses them in new ways. [ABSTRACT FROM AUTHOR]

Model-Based Design of complex software systems is an activity that requires the use of different modeling formalisms, with different perspectives of the system, to cover all relevant aspects of the system, to avoid over-design, to employ manageable models and to support system integration. The comprehensive use of models in design has created a set of challenges beyond those of supporting one isolated design task. In particular, the need to combine, couple, and integrate models at different levels of abstraction and in different formalisms is posing a set of specific problems that must be tackled. Multi-Paradigm Modeling is precisely the research field to focus on developing an appropriate set of concepts and tools to address the challenge of integrating models of different aspects of a software system specified using different formalisms and eventually at different levels of abstraction. This paper summarizes the results of the 3rd Workshop on Multi-Paradigm Modeling: Concepts and Tools. [ABSTRACT FROM AUTHOR]