Establishes image quality requirements (performance specifications) for the design and evaluation of single- and multi-colour VDTs. At present, the recommendations are based on Latin, Cyrillic, and Greek origin alphabetic characters, and Arabic numerals. Office tasks include such activities as data entry, text processing, and interactive inquiry. Annex A describes analytical techniques for predicting screen flicker, Annex B an empirical method for assessing temporal and spatial instability (flicker and jitter) on screen, Annex C a comparative user performance test method.