The delivery of ITSM starts with a clear definition of the portfolio of services that IT manages; both customer-facing business services and technical services that IT uses to drive the business. Each of these services goes through a lifecycle, with most going through many iterations of continuous improvement as the business evolves and IT matures.
The Service Catalog provides a means for IT to communicate the value to the business of IT Services. It contains understandable information for the business on the nature of the services provided and what they can expect from them. This includes, but is not limited to: Service Level Agreements, Support Arrangements and Availability, Costing and Provisioning Details.