The different states of a change include the following:

• Closed - The event audit trail and lifecycle with the addition of any information from the event closure activity.
• Derived - A new event created as a result of correlation across multiple events, usually signifying some new out-of-tolerance conditions requiring action.
• Escalated - An event, or set of events, that requires re-examination and filtering as a result of event processing or correlation. This is typically indicated by increasing the priority classification.
• Processed - An event which has been analyzed as to the cause of the out-of-tolerance conditions which led to its creation and for which a plan, within the scope of event management, has been formulated to resolve those conditions.
• Ready for Closure - The complete audit trail of an event and all states of processing through its lifecycle.
• Significant - Unsolicited, (formatted), significant information which must be communicated from a managed object for the purpose of meeting a management objective.
  An Alert is an example of a significant event. It is defined by ITIL as: "A warning that a threshold has been reached, something has changed, or a Failure has occurred. Alerts are often created and managed by System Management tools and are managed by the Event Management Process." ¹

¹ ITIL Glossary