In this work, a new type of collaborative learning activity is proposed in order to enable students to explore and understand information in highly mobile situations. We call this “mobile sensemaking” and is based on people engaged in multiple parallel, rapid and ad-hoc interactions, rather than structured decision processes. This activity takes place in a traditional classroom context, thus proposing a new way to design more participative and active “lectures”. Mobile sensemaking proposes a proximity model and uses mobile computing devices in order to carry on collaborative activities according to the domain context and physical proximity.