The predecessor to ISO20000 was the British Standard BS 15000. Initially, it adhered to the process methodologies defined by the UK Department of Trade and Industry within ITIL (Information Technology Infrastructure Library). Over time, it evolved into ISO20000, which is now a globally recognized standard for IT service management.

The IT Service Management system is divided into two main components: one is the Management Specification, or simply "Specification," which can be referred to as an introduction to IT service management standards; the other is the Code of Practice, which can be termed as a guide to practice.

ISO 20000 is known as the Information Technology Service Management System Certification in Chinese, and its business categories are broadly divided into the following fourteen types: Information System Consulting and Planning; Information System Software Design and Development; Information Technology Consulting; Information System Testing; Software Product Testing; Information System Engineering Supervision; Software Engineering Supervision; Infrastructure Operation and Maintenance; Hardware Operation and Maintenance; Software Operation and Maintenance; E-commerce Support; Software Operation; Data Processing; Call Center Service Desk.

ISO 20000, in simple terms, is an IT service management standard for organizations, primarily designed to provide a model for enterprises to establish, implement, operate, monitor, review, maintain, and improve their IT service management systems.

Allow IT managers to have a corresponding reference for managing IT services. In other words, the existence of ISO 20000 ensures consistency in both internal and outsourced IT infrastructure, benefiting the company, employees, and customers alike.