Purchasing management and information system management play highly strategic roles in modern companies, particularly in large multinationals because purchasing often accounts for more than half the total revenues and constitutes a main source of competitive advantage (Murtaza, Gupta, & Carroll, 2004). Information systems can be used as tactical piloting tools enabling an optimization of operational management, information flows, resource allocation, competitive and technological watching, knowledge management and sharing, internal and external collaboration, and decisional analysis (Choi & Suh, 2005). Thus, associating these two functions (IS and purchasing) creates a powerful internal coalition capable of developing processes that will advance the cause of sustainability in its economic, ecological, and social dimensions (Allal-Chérif & Favier, 2008).