ISO 20000-1 is a standard
that outlines the requirements for a service management system (SMS). It is a framework that helps organizations to deliver high-quality IT services to their customers or clients in a consistent and efficient manner. The standard is based on the international service management standard, ISO/IEC 20000-1, and is designed to be used in conjunction with the IT service management framework, ITIL (Information Technology Infrastructure Library).
A consultancy is a company or individual that provides expert advice, guidance, or assistance to businesses or organizations in a particular field or area of expertise. In the case of ISO 20000-1, a consultancy could provide support to an organization in the process of implementing and maintaining an SMS that meets the requirements of the standard. This could include helping the organization to understand the requirements of the standard, providing guidance on how to effectively implement and document the system, and assisting with the process of obtaining certification to the standard.