In order to improve the practice of CSCW research, we need to consider the process of system development, analyze system usage, and redesign the improved system based on the implications from the analysis. In working towards these goals, we have formulated an international research group consisting of engineers and sociologists, and have reported the initial results of our research at conferences such as CSCW, CHI, and ECSCW. In this seminar, through an introduction of our research in chronological order, I will discuss how engineers and sociologist have been effectively working together within CSCW research.