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The Information Technology Infrastructure Library (ITIL) is a set of concepts and practices for Information Technology Services Management (ITSM), Information Technology (IT) development and IT operations.
The IT Infrastructure Library originated as a collection of books, each covering a specific practice within IT Service Management. ITIL was built around a process-model based view of controlling and managing operations often credited to W. Edwards Deming and his plan-do-check-act (PDCA) cycle .

After the initial publication in 1989, the number of books quickly grew within ITIL v1 to over 30 volumes.

In 2000/2001, to make ITIL more accessible (and affordable), ITIL v2 consolidated the publications into 8 logical "sets" that grouped related process-guidelines to match different aspects of IT management, applications, and services. However, the main focus was known as the Service Management sets (Service Support and Service Delivery) which were by far the most widely used, circulated, and understood of ITIL v2 publications.

* In April 2001 the CCTA was merged into the Office of Government Commerce (OGC), an office of the UK Treasury.
* In 2006, the ITIL v2 glossary was published.
* In May 2007, this organization issued the version 3 of ITIL (also known as the ITIL Refresh Project) consisting of 26 processes and functions, now grouped under only 5 volumes, arranged around the concept of Service lifecycle structure.
* In 2009, the OGC officially announced that ITIL v2 would be withdrawn and launched a major consultation as per how to proceed.