Describes the core concepts of ISO/IEC 20000, identifying how the different parts support ISO/IEC 20000‑1:2011 as well as the relationships between ISO/IEC 20000 and other International Standards and Technical Reports. This part of ISO/IEC 20000 also explains the terminology used in ISO/IEC 20000, so that organisations and individuals can interpret the concepts correctly. This TR is for a) service providers considering using any part of ISO/IEC 20000 and looking for guidance on how to use the different parts of ISO/IEC 20000 to achieve their goal, b) service providers that wish to understand how ISO/IEC 20000 can be used in combination with other International Standards, and c) practitioners, auditors, and other parties who wish to gain an understanding of ISO/IEC 20000.