This part of ISO/IEC 20000 gives guidance on a phased approach to implement an SMS that fulfils the requirements specified in ISO/IEC 20000-1. The phased approach provides a structured framework to agree priorities and manage the implementation activities. This part of ISO/IEC 20000 illustrates a generic, three-phase approach to manage the implementation. The service provider can tailor the phases to suit its needs and its constraints. This part of ISO/IEC 20000 can also be used with ISO/IEC 20000-2, ISO/IEC TR 20000-3 and ISO/IEC TR 20000-4.