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International Standard ISO/IEC 26514
Systems and software engineering -- Requirements for designers and developers of user documentation
ISO/IEC 26514:2008 provides requirements for the design and development of software user documentation as part of the life cycle processes. It defines the documentation process from the viewpoint of the documentation developer. ISO/IEC 26514:2008 also covers the documentation product. It specifies the structure, content, and format for user documentation, and also provides informative guidance for user documentation style. It is independent of the software tools that may be used to produce documentation, and applies to both printed documentation and on-screen documentation. Much of ISO/IEC 26514:2008 is also applicable to user documentation for systems including hardware.
Online IEEE Catalog: http://www.iso.org/iso/catalogue_detail?csnumber=43073