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This part of ISO 9241 describes visual user-interface elements presented by software and provides requirements and recommendations on when and how to use them. This part of ISO 9241 is concerned with visual software components of interactive systems to make human-system interaction usable. This part of ISO 9241 provides a comprehensive list of generic visual user-interface elements in whatever context these elements are being implemented. The guidance given in part 161 is intended to be used in conjunction with ISO 9241 guidance on interaction techniques. It recognizes that additional elements can evolve. It also addresses derivates, compositions (assemblies) and states of user-interface elements. It gives requirements and recommendations on selection, usage and dependencies of visual user-interface elements and their application. It is applicable regardless of a fixed, portable or mobile interactive system, or cross-device use. It does not provide detailed coverage of the methods and techniques required for design of visual user-interface elements. This standard does not address implementation (e.g. graphical design of elements) and interaction details for specific input methods or technologies. It does not cover decorative user-interface elements that are intended to address solely aesthetic (hedonic) qualities in the user interface eg. background images. The information in this part of ISO 9241 is intended for use by those responsible for the selection and implementation of visual user-interface elements in interactive systems and for evaluating user interfaces. It is intended for use by those planning and managing platform specific aspects of user interface screen design. It also provides guidance for human factors/ergonomics and usability professionals involved in human-centred design. It addresses technical issues only to the extent necessary to allow users of this international standard to understand the relevance and importance of a consistent interface element usage and selection in the design process as a whole.