This chapter begins by discussing what Knowledge Building entails from a Knowledge Management (KM) perspective. In operationalizing stage one of the KM model applied in this book, it thereafter identifies practices that can be conceptualized as Knowledge Building activities in the UN First Committee cyber negotiations. Overall, the chapter reveals that a permanent, formal and dedicated mechanism designed to create or foster the injection of input into the discussions has not been embedded into the architecture of this process. Rather, it is shown that Knowledge Building has occurred through the engagement of negotiation participants via a range of interpersonal activities, as well as through their personal consultation of material resources. These activities have been undertaken in both formal and informal spaces and have been dependent upon the initiative of negotiation participants themselves. Moreover, the identified practices are found to have occurred on an iterative as well as relatively structured and consistent basis.