This part of ISO 9241 provides an introduction to the other parts in the ISO 9241 “300” subseries, and explains its modular structure. The ISO 9241 “300” subseries establishes requirements for the ergonomic design of electronic visual displays. These requirements are stated as performance specifications, aimed at ensuring effective and comfortable viewing conditions for users with normal or adjusted-to-normal eyesight. Test methods and metrology, yielding conformance measurements and criteria, are provided for design evaluation. The ISO 9241 “300” subseries is applicable to the visual ergonomics design of electronic visual displays for a diversity of tasks in a wide variety of work environments.