The T1Q1.5 Video Teleconferencing/Video Telephony (VTC/VT) ANSI Subworking Group (SWG) was formed to draught a performance standard for digital video. Important questions were asked, relating to video digital performance characteristics of video teleconferencing/video telephony: - Is it possible to measure motion artefacts with VTC/VT digital transport? - If it can be done by objective measurements, can they be matched to subjective tests? - Is it possible to correlate the objective measurements of analogue and digital performance specification? The VTC/VT Subworking Group's goal is to answer these questions. It has become a first step to the process of constructing the performance standard.