Normal Changes are changes which meet predefined criteria that qualify them for handling via the Normal Change Management process.
Standard Changes are changes which are pre-approved for implementation. Generally, Standard Changes are low risk and occur frequently in the environment. Examples might include such things as :
- Password resets
- New hire procedures
- Office moves
Emergency Changes are changes which meet predefined criteria that qualify them for handling via the Emergency Change Management process. In most environments, Emergency Changes are those which cannot be foreseen and which unless addressed quickly put the environment at high risk of impact. Emergency Changes are reviewed by the Emergency Change Advisory Board (ECAB).
**Source by wikipedia**
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