The purpose of this paper is to test Poisson models using repeated cross-section data, in the evaluation of the opportunities of partnership between small and medium sized firms - favoured by the European Union through Europartenariat - when the subject of the analysis is the typical European firm. Since contacts between firms are relatively few in numbers, Poisson regression models related to different projects and firms' profiles are estimated by implementing a GEE procedure. The idea of analysing a representative firm in a cohort-based framework allows us to study it in a dynamic perspective. In addition, normative evaluation of economic policy impact will be possible.