This study applies the boundary spanning theoretical perspective to a client behavior during outsourced IS development projects. Previous research shows the importance of internal communication in an organization when it adopts an integrated IS. It also points to the importance of managing communication with outsourcing vendor. The proposed research makes a unique contribution to the literature by investigating the connection between these two types of communication. The two main questions of the study are how a boundary spanning culture in an organization affects internal and external boundary spanning during an outsourced project, and if a client’s boundary spanning contributes to success of the outsourced project by improving the quality of relationship. Survey based data collection contributes to the methodology of boundary spanning research, which was previously based exclusively on qualitative analysis. Uncovering the implications of client boundary spanning capabilities for outsourcing relationship management will be of significant value for practitioners.