Version 2 of ITIL (IT Infrastructure Library) consisted of 7 sets: Service Support; Service Delivery; Planning to Implement Service Management; ICT Infrastructure Management; Applications Management; Security Management; The Business Perspective. However, the main focus was generally divided into two main areas, known as ITIL Service Delivery and ITIL Service Support.
Service Delivery is the management of the IT services themselves, and involves a number of management practices to ensure that IT services are provided as agreed between the Service Provider and the Customer. In includes 5 disciplines: Service Level Management, Capacity Management, Continuity Management, Availability Management, and IT Financial Management
Service Support is the practice of those disciplines that enable IT Services to be provided effectively. The 6 Service Support disciplines are: Configuration Management, Incident Management, Problem Management, Change Management, Service/Help Desk and Release Management.