The book has become the standard work in technical documentation. The structures developed by the author from practical experience enable a systematic approach to creating technical documentation and quickly lead to high-quality, user-friendly instructions. The 3rd edition continues this proven concept. The book has been completely revised, enriched with new insights from the author, and aligned with current standards and guidelines. Almost all examples have been modernized. A new chapter systematizes preliminary considerations and analyses. The chapter on "Safety" is now at the top level of the structure. Additionally, the author provides an outlook on how the systematics can be applied to online and mobile documentation.