This part of ISO 9241 enables users of standards related to software ergonomics to identify ergonomics standards particularly relevant to software development, gain an overview on the content of software-ergonomics standards, understand the role of software-ergonomics standards in specifying user requirements as well as designing and evaluating user interfaces and understand the relationship between the various standards. The software-ergonomics standards are applicable to all those software components of an interactive system affecting usability, including: - application software (including web-based applications); - operating systems; - embedded software; - software development tools; - assistive technologies.