Human-centred design is an approach to interactive systems development that aims to make systems usable and useful by focusing on the users, their needs and requirements, and by applying human factors/ergonomics, and usability knowledge and techniques. This approach enhances effectiveness and efficiency, accessibility and sustainability and improves human well-being, user satisfaction and counteracts possible adverse effects of use on human health, safety and performance which result from use of the system. There is a substantial body of human factors/ergonomics and usability knowledge about how human-centred design can be organized and used effectively. DIN EN ISO 9241-210 aims to make this information available to help those responsible for managing hardware and software design and re-design processes to effectively and timely identify and plan human-centred design activities. The human-centred approach to design described in DIN EN ISO 9241-210 complements existing systems design approaches. It can be incorporated in approaches as diverse as object-oriented, waterfall and rapid application development. The principles of human-centred design and the related activities have not changed substantially since DIN EN ISO 13407 was produced and have been validated by ten years of application. DIN EN ISO 9241-210 reflects this by making requirements as well as recommendations. DIN EN ISO 9241-210 is a part of an extensive standard series on the topic Ergonomics of the human-system interaction. In the series, ergonomic requirements in different fields such as, for instance, software, screens, input devices, workplaces, environment and control rooms are specified. DIN EN ISO 9241-210 is thereby allocated to the field of processes of human-system interaction. DIN EN ISO 9241-210 will replace DIN EN ISO 13407:2000-11. The Committee responsible for this standard is NA 023-00-04-05 GAK "Gemeinschaftsarbeitskreis NAErg/NIA: Benutzungsschnittstellen") ("Joint working group NAErg/NIA: User interfaces") at DIN.