was published by Office of Government Commerce in the
1980s.Its purpose is to provide an objective, exact and
measurable standard[4]. ITIL is a framework with best
practices, The latest version is ITIL v3. Its core architecture
is based on service lifecycle, which contains service strategy,
service design, service transition, service operation and
service improvement. Service strategy is the core of the
service lifecycle while service design, service transition and
service operation are implementation phases. Service
improvement is based on strategy goals to improve the
services[5].