In the last decades, model based methodologies have become the mainstay of research on embedded systems development. The availability of mature computer aided tools and of well-settled industrial practices has promoted the adoption of these methodologies in large companies, which are able to amortize the cost on a large volume of products. On the contrary, the cost of software licenses and of staff training often discourages their application in small and medium enterprises. In this paper, we

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... esent a model based methodology entirely based on the adoption of open source software tools. We have applied this methodology to a real case study provided by our industrial partner proving its effectiveness.