The ITIL Availability Management discipline is defined as part of the Service Delivery set. In essence, it allows organizations to sustain the information technology service's availability in order to support the business at a justifiable cost.

The mission statement for Availability Management is: Optimize the capability of the IT infrastructure, services and supporting organization to deliver a cost effective and sustained level of service availability that meets business requirements

The main elements of this discipline are as follows:
Determine the Availability Requirements
Compile the Availability Plan
Monitor Availability
Monitor Maintenance Obligations.