ITIL defines service management as “a set of specialized organizational capabilities for providing value to customers in the form of services. The capabilities take the form of functions and processes that are used to manage services over their Lifecyle.
ITIL contains a set of five publications, the ITIL Core, which provide structure, stability, and strength to an IT organization’s service management capabilities. The structure of the core is in the form of an iterative life cycle, as seen in Figure 1. Each publication represents a phase of the Lifecycle and is noted in the following list: