Since the mainstream uptake of computers and the internet, our world has become increasingly virtualised. Modern organisations are deeply reliant on virtual technologies to carry out their business across time and distance. Indeed, virtual technologies are now implicated in almost all organisational activities, from (virtual) meetings to (online) collaboration. Many scholars have been drawn to investigate the new organisational phenomena that have resulted from the virtualisation of our world, such a virtual learning, virtual leadership and virtual decision making.My research, however, tackles a more fundamental question about how organising more generally is accomplished in the virtual age. Namely, the research question is, "How does sensemaking, as the basis of organising, take place in virtual settings?" To explain, sensemaking -a foundational concept in Organisation Studies -underpins all organisational activities. Therefore understanding how sensemaking takes place in virtual settings will necessarily illuminate how organising more generally is accomplished virtually.To date, how sensemaking takes place in virtual settings has hardly been studied. Further, the studies that do exist impose Weick's (1969Weick's ( , 1979Weick's ( , 1995 theory of sensemaking (which was developed at a time pre-dating virtual technologies) on to the new context. As a result, existing studies do not illuminate what is new, unique and interesting about how we make sense in virtual settings. In this thesis I develop an alternative, practice-based conception of sensemaking (which serves as the theoretical framework for the study) that sensitises me to previously overlooked but critical concepts, namely materiality, embodiment and ongoing accomplishment. First, materiality describes how things, which in virtual settings are often digital, are implicated in sensemaking.Second, embodiment describes how physical bodies, and their digital representations in virtual settings, are involved in accomplishment of activities. Finally, ongoing accomplishment describes how sensemaking takes place in the flow of activities as they are carried out in the physical world, the virtual world, or combination of both. This framework also enables me to position activities as the unit of analysis for sensemaking. Taken together, this is a novel approach that reveals new facets of the phenomenon of sensemaking in virtual settings.This theoretical framework is applied in three different fieldsites (of varying levels of virtuality) which are selected using a virtuality continuum developed within the thesis. These fieldsites are Yammer (a social media platform), telepresence (a video-based collaboration platform), and Second Life (a three-dimensional virtual world). The methodology is a hybrid traditional-virtual ethnography in which data is collected through participant observation, ii complemented by interviews. Empirical data are presented in the form of accounts that exemplify the key activities of practitioners in each fieldsite. The analysis rev...