ITU-T P.910 (10/2023) is the controlling recommendation for subjective assessment of multimedia video quality - the streaming, conferencing, mobile, and user-generated-content world most engineers work in. It defines the core test methods: ACR (section 8.1) and its sensitivity floor (8.1.1), DCR/DSIS (8.2), CCR/DSCS (8.3), Pair Comparison (8.4), SAMVIQ (8.5), and ACR-HR with the differential-viewer-score formula (8.6.2). It also specifies source-stimulus selection including the SI/TI scene metrics (section 7), viewing conditions (9), the number of subjects (10.1), experiment design and fatigue limits (11), training, randomization, and screening (12), and mandatory reporting (14). The 2023 edition is the consolidated one: it absorbed the former P.911 and P.913 (P.913 was formally deleted on 2 February 2024), so today it is the single current reference for these methods. Cite this edition, not the 1999 or 2008 versions still indexed online. Its broadcast-television companion is ITU-R BT.500-15.
