This paper presents the observational result of a preliminary study which aim to investigate the user interaction for collaborative Augmented Reality (AR) interface. AR, a new technology for educators, indicates potential to support individual learning. So far, however, there has been less research works conducted to investigate the potential of AR in collaborative learning. This study aims to fulfill that gap. Several students from different fields have been recruited as volunteers in this study. The observational results show that AR could support various types of communication cues and even its space can be used as a shared point of reference to create a mutual understanding in collaborative learning environment. These results at final point, could strengthen the conjectures that AR can be used to support a collaborative learning. © 2011 IEEE.