The development of complex products and services require the domain of distinct types of knowledge that enterprises do not usually hold. In order to address this problem, the issue of assessment the knowledge circulation in collaborative environments started to attract attention. Starting with some discussion on mechanisms of production and circulation of knowledge that might operate in a collaborative environment, this paper introduces an approach for assessing knowledge circulation in a co-innovation network. Finally, based on experimental results from a Portuguese collaborative network, BRISA network, a discussion on the benefits, challenges and difficulties found are presented and discussed.