• Five stages documented in five volumes, forming the ITIL core
  • Service Strategy, Service Design, Service Transition, Service Operation and Continual Service Improvement
  • Tracks a service from inception to retirement
  • Service Strategy is the hub that drives the lifecycle
  • CSI looks for improvements in all stages.


Figure 4: The service lifecycle

The core is supplemented by complementary guidance, specific to industry sectors, organisation types, operating models and technology architectures.

Service Strategy

Purpose and objectives

To define:

  • What a service provider needs to do to support its customer
  • A strategy to ...

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