Considering that cooperation among enterprises contributes significantly to improve the product performance in a supply chain, this work presents a method for evaluating the enterprise cooperation focused on the exchange of information among firms. Two indexes are used: the intensity, which seeks to measure the amount of information shared; and the extension, which seeks to measure how many stages of the supply chain are exchanging information both upstream and downstream. The proposed method was applied to eighteen auto part firms of Campinas region in Brazil. The intensity and the extension indexes for each enterprise were measured and some relevant conclusions regarding to information exchange for automotive sector are presented.