Web services is an extremely promising technology that has the potential to revolutionize many aspects of information systems. Web services facilitates vendor-, platform-, and language-independent, loosely coupled, inexpensive integration of both internal and external systems. Although there is a general agreement that Web services will have a significant impact on applications of information technology in organizations, there is a disagreement regarding the speed and spread of assimilation due to a multitude of inhibitors. In this article, we identify 3 areas of assimilation of Web services in organizations: information systems departmental assimilation, intraorganizational assimilation, and interorganizational assimilation. We propose a research framework for investigating various issues related to organizational assimilation of Web services. In addition, we developed a projection of the assimilation patterns for the 3 areas of organizational assimilation of Web services. Based on the proposed framework, we outline a research agenda on the organizational assimilation of Web services.