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In this paper we propose an approach for the integration of functional models with non-functional models in the context of model-driven e-service development. Starting from the observation that current approaches to model-driven development have a strong focus on functionality, we argue the necessity of including non-functional aspects, as early as possible in the service design process, from the architectural (computational independent) level through all MDA layers. Furthermore, we distinguish between two modelling spaces (orthogonal to the MDA view), the design space and the analysis space, which could be integrated by means of model transformations. Thus, relating the analysis results to the original design models can be achieved by following a sequence of steps that entail horizontal model-to-model transformations from the design space to the analysis space, vertical model-to-model transformations (within and between the MDA layers) and proprietary analysis techniques that are used for the derivation of required (quantitative) properties. This provides a framework for incorporating nonfunctional analysis into methodological support for e-service development.