Several researchers argue that cognition is distributed between a person and its environment, including its social environment and we often speak of joint cognition to refer to several people that interact so closely that they start to form a single, distributed, cognitive system. We aim to make a step in the study of such a distributed cognitive system that arises when people collaborate to perform some joint activity. More specifically, we explore how socio-cognitive processes underlying joint cognition are reflected in the eye-movements of the collaborators. We are interested in finding patterns in collaborators’ eye-movements that are related to the type or the quality of interaction. Incidentally, we explore whether, and how, eye-movements reflect cognitive and collaborative processes which people are engaged in.