Although there are five phases throughout the Lifecycle, they are not separate, nor are the phases necessarily carried out in a particular order. The whole ethos of the Service Lifecycle approach is that each phase will affect the other, creating a continuous cycle. For this to work successfully, the Continuous Service Improvement (CSI) phase is incorporated throughout all of the other phases. Figure 3.C demonstrates some of the key outputs from each of the Service Lifecycle Phases.
Figure 3.C – How does the Service Lifecycle Work?
It is important to note that most of the processes defined do not get executed within only one lifecycle phase.
Service Strategy Phase: Determine the needs, priorities, demands and relative importance for desired services. Identifies the value being created through services and the predicted financial resources required to design, deliver and support them.
Service Design Phase: Designs the infrastructure, processes and support mechanisms needed to meet the Availability requirements of the customer.
Service Transition Phase: Validates that the Service meets the functional and technical fitness criteria to justify release to the customer.
Service Operation Phase: Monitors the ongoing Availability being provided. During this phase we also manage and resolve incidents that affect Service Availability.
Continual Service Improvement Phase: Coordinates the collection of data, information and knowledge regarding the quality and performance of services supplied and Service Management activities performed. Service Improvement Plans developed and coordinated to improve any aspect involved in the management of IT services.