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Difference Between Normal, Emergency & Standard Change

In ITSM, change processes play a major role. Depending on the timing, duration, and urgency of change, the process is classified into three major categories.

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Below are the differences between these three types of change requests.

NormalStandard Emergency
Any service change that is not a standard change or an emergency change.A standard change is a pre-authorized change that is low risk, relatively common and follows a specified procedure or work instruction.A standard change is frequently implemented, has repeatable implementation steps, and has a proven history of success.
Normal change requests follow a prescriptive process which requires two levels of approval before being implemented, reviewed, and closed.Approved standard change requests can be predefined in a catalogue of templates to make accessing and requesting a standard change more efficient. This change is of such a high priority that it bypasses group and peer review and approval and goes straight to the Authorization state for approval by the CAB approval group.
These changes are most often scheduled outside of defined change blackout windows or during defined maintenance windows. The normal type is used to implement beneficial change for any change to a service that is not a standard or emergency change.During an emergency change, there are chances that an unplanned CI change activity occurs. During such a case, an unauthorized change request is created and sent for approval. During an emergency change, there are chances that an unplanned CI change activity occurs. During such a case, an unauthorized change request is created and sent for approvals. 

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