(2) ITIL defines an event as "any detectable or discernable occurrence that has significance for the management of the IT infrastructure or the delivery of IT service and evaluation of the impact a deviation might cause to the services." (ITIL Service Operation book, Page 35).

See Getting Started with Event Management on ITSMWatch.com.
See also Tips for Implementing ITIL in the Quick Reference section of Webopedia.
 

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