Activity Theory provides a framework to examine and explain human-human and human-computer interactions. In this study, Activity Theory was used to examine both interactions in depth in the context of Computer Supported Collaborative Business Process Modeling (CSCBPM) in which geographically dispersed multiple users interact with each other and with the system. This framework enabled us to examine the activities of CSCBPM in detail and understand the process of CSCBPM. During the CSCBPM, some difficulties were identified between the components of Activity Theory framework. The difficulties and how they were handled are also presented and some system design suggestions were offered to increase efficiency of interaction in CSCBPM.