The ITU Radiocommunication Assembly considering that studies are in progress to develop stereoscopic television as a potential future broadcast service; that Recommendation ITU-R BT.1198 has been established for stereoscopic television based on R- and L-eye two channel signals; that subjective assessments are a vital element in the design and introduction of stereoscopic television systems; that shooting conditions, viewing conditions and type of display may influence observer fatigue; that common assessment conditions appropriate for stereoscopic television systems should be established; these conditions should include evaluation methods, shooting conditions, viewing conditions, test materials to be used in the assessment and screening methods to ensure that observers have normal depth perception