Normal & Expedited
Difference between Normal and Expedited is based on lead time and is calculated by ServiceNow when change is submitted for approval.
Emergency
Starts from a P1 Incident and recorded after the fact.
Standard Change
Start from a template after the template has been approved by CAB for use.
SDLC (Software Development Life Cycle) Change Requests
"ServiceNow Change Request" is the dividing line between development (SDLC) and production. ServiceNow Change Requests hold all information about Production changes which includes (and more):
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ServiceNow Change Request, link to Jira if one exists (starts the "Raise and Record" Change step)
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Risks and Impact
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Timing
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Approval(s)
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Implementation plan for Production
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Verification
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Closure information