Standard - pre-approved, low risk and common
Emergency - must be made as soon as possible
Normal - addition, modification, or elimination
The difference between standard and normal is not so easy to understand. But what I can tell you about those three types of change is that emergency must be always avoided. If every change is conducted as an emergency, very soon the building will be on fire. In this kind of enviroment, be sure you're using your kevlar clothes.
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