Abstract. Domain Specific Modeling Languages (DSMLs) are essential elements in Model-based Engineering. Each DSML allows capturing certain properties of the system, while abstracting other properties away. Nowadays DSMLs are mostly used in silos to solve specific problems. However, there are many occasions when multiple DSMLs need to be combined to design systems in a modular way. In this paper we discuss some scenarios of use and several mechanisms for DSML combination. We propose a general framework for combining DSMLs that subsumes them, based on the concept of viewpoint unification, and its realization using model-driven techniques. 1

Abstract. In the late 1990's, there was substantial activity within the \Web engineer-ing " research community and a multitude of new Web approaches were proposed. How-ever, numerous studies have revealed major gaps in these approaches, including cover-age and interoperability. In order to address these gaps, the Model-Driven Engineering (MDE) paradigm offers a new approach which has been demonstrated to achieve good re-sults within applied research environments. This paper presents an analysis of a selection of Web development methodologies that are using the MDE paradigm in their develop-ment process and assesses whether MDE can provide an effective solution to address the aforementioned problems. This paper presents a critical review of previous studies of classical Web methodologies and makes a case for the potential of the MDWE paradigm as a means of addressing long-standing problems of Web development, for both research and enterprise. A selection of the main MDWE development approaches are analyzed and compared in accordance with criteria derived from the literature. The paper con-cludes that this new trend opens an interesting new way to develop Web systems within practical projects and argues that some classical gaps can be improved with MDWE.

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