“…A technique for simultaneous collaborative control of a small manipulator arm with the operator functionalities stop, speed-up, slow-down, move-orthogonal with respect to a preplanned trajectory was presented in Tarn, Chuanfan Guo, and Wu (1996) together with experimental results. The combination of potential fields and constraints in limiting or guiding a human operator in controlling a manipulator was considered in Aigner and McCarragher (1997).…”