The aim of this paper is to combine evolutionary economics and social network analysis to empirically evaluate the impact of network based policies. The evaluation of these policies is undertaken in the framework of behavioral additionality. In the case study we concentrate on a techological district located in
southern Italy to investigate whether the institution of the district has altered the mechanisms by which research collaborations are established amog actors. Results from structural holes analysis and blockmodeling show that indeed a mechanisms of global bridging expanded research collaborations beyond the previous local trajectory.
