This Recommendation is intended to define non-interactive subjective assessment methods for evaluating the quality of digital video images coded at bit rates specified in classes for TV3, MM4, MM5 and MM6, as specified in Table D.2 for applications such as videotelephony, videoconferencing and storage and retrieval applications. The methods can be used for several different purposes including, but not limited to, selection of algorithms, ranking of video system performance and evaluation of the quality level during a video connection.