... aver-age, the subjects in this study spent about a quarter of the interaction looking at the robot head, and changed their gaze to the robot 23.5 times over the course of the interaction. Again, there ... assembly of the objects. Also, othermeasures of the user’s gaze behaviour might be885Proceedings of the 47th Annual Meeting of the ACL and the 4th IJCNLP of the AFNLP, pages 879–887,Suntec, Singapore, ... wide range of subjective and ob-jective measures of the quality of the in- teractions. To assess which aspects of the interaction had the greatest impact on the users’ opinions of the system,...