BS EN ISO 9241-20:2009 Ergonomics of human-system interaction - Accessibility guidelines for information/ communication technology (ICT) equipment and services
2021BS EN ISO 9241-20:2021 Ergonomics of human-system interaction. An ergonomic approach to accessibility within the ISO 9241 series
2009BS EN ISO 9241-20:2009 Ergonomics of human-system interaction - Accessibility guidelines for information/ communication technology (ICT) equipment and services