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Several interpretations converge in defining innovation networks as formed by heterogeneous actors, mainly identified in universities, research centers, and business companies. While the issue of actors' heterogeneity has generated active debate in strategy and organization studies, there has been little discussion so far in exploring the role of this diversity in innovation networks. Drawn from previous literature, we identify six attributes of actors' heterogeneity which seem to matter for the development of collaborative innovation: goals, knowledge bases, capabilities and competences, perceptions, power and position, culture. This paper is aimed at pursuing issues in need of further investigation. In particular 1. how the interplay of diverse actors' attributes shapes the interaction process in the development of collaborative innovation; 2. if and how combinations of their attributes are more likely to generate certain …