This research analyzes the performance of two Brazilian business networks, Campina Grande and João Pessoa. The results reveal significant differences according to the operation mode in these networks. The network of Campina Grande has a dynamic operation that brings positive results to the group in contrast to that of João Pessoa. Its functioning can be explained by four variables that affected their performance : the role of institutions, the expectation of members and their collective and long term vision, the selection of partners based on a set of criteria, and the transfer of knowledge at several levels of the network. The network of João Pessoa remained an emerging and informal network. The members are rather motivated by individual and short-term goals.