The English commercial affairs bureau (OGC: Office of Government Commerce), the best practice regarding the service management operational rule IT is the consecutive guidebook which was collected harmony and inclusively. When executing the service management IT, being something which standardizes business process and technique systematically, inside the company regarding IT the case where it does the setting second look at rule and procedure etc. it is utilized as the guideline.

ITIL has consisted of seven books.

1. Service Support: Service support (alias: Blue book)
2. Service Delivery: Service delivery (alias: Red book)
3. Security Management: Security management
4. The Business Perspective: The point of view from IS in viewpoint service offering of business
5. ICT Infrastructure Management: ICT infrastructure management
6. Applications Management: Application management
7. Planning to Implement Service Management: Service management implementation planning plan (alias: Green book)

The fact that it is inside and core this is, "service support" and "service delivery".

Service support being something which is recorded in regard to daily system operation and user support, consists of one function and five process. As a function, it becomes the inquiry window from the user, the "service desk", as a process "problem management" "modification" release management "incident management" "of" configurations management "of management" is stipulated.

As for service delivery being something which was collected concerning plan and the improvement regarding the system operation control in middle long term, it consists five process. There is "service level management (SLM)" on higher rank, four process of "availability management" "capacity management" "IT service financial management" "IT service continuity management" are placed in order to achieve the service level which is decided here.

As for ITIL being something which defines actual process, as a management guide, there is a PD 0005 business standard on the higher rank furthermore "BS 15000 - there is a ITService Maganement " of the English standardon that higher rank. BS 15000 is standardized internationally in 2005Decemberas ISO/IEC 20000. ITIL is something which shows the process in order to clear ISO and BS etc., it differs from generally known standard and standard.

As for ITIL as information system management criteria of the English government government and municipal offices, in 1989 the English central computer telecommunications bureau (CCTA: The first edition was published Cental Computer and Telecommunication Agency) by. CCTA is integrated in OGC which is established to 2000, presently OGC has owned ITIL.

The ITIL book is set, national copyright (crown copyright) without permission the copy and the publication and alteration is not possible, but there is no restriction in regard to applying the contents of ITIL to the service of the respective company. As for selling the ITIL book the public periodical publication which it divides commercializes from OGC (TSO: The Stationery Office) is.

As for ITIL application at general enterprise is encouraged from beginning, non-profit body itSMF for ITIL promotion (IT Service Management Forum) is established by 1991, the branch is established in consecutive world nations.

ITIL based qualification test development starts from 1990, three non-profit bodies of EXIN (Examination Institute for Information Science), ISEB (Information Systems Examinations Board) and Loyalist College of Applied Arts and Technology which at present OGC it recognizes as the qualifying examination execution system have executed Formal Qualification Testing. The qualifying examination education enterprise which is confided from the test system in regard to training has done.