Anniversary editorial, T A Dean & R Davies.;Editorial, T A Dean. Guest editorial: robotics and AI, D T Pham. Development of a six-degree-of-freedom vibratory device for locating objects, D T Pham & J Menende;. Application of acoustic emission sensing to slip detection in robot grippers, S Rangwala et al . A target tracking algorithm using a sensor with biological vision features, C Narathong et al . Knowledge-based visual part identification and location in a robot workcell, K D Rueb & A K C Won;. Planning for three-finger tip-prehension grasps, Z Ji & B Roth. A;free ranging AGV, G Drunk. The next stage in the use of robots for assembly, A H Redford. A formal approach to specifying assembly operations, L S Haynes & G H Morri;. Announcement.