Changes can be broadly divided into three types: standard, normal, and emergency changes.
Standard changes: These are preapproved changes that are low-impact, well-known, and documented.
Example: Replacing a printer's ink cartridge
Normal changes: A normal change needs to follow the entire change process; it should be scheduled, have its risk assessed, and be authorized. Normal changes include both minor (low to medium impact and urgency) and major changes (high impact and urgency).
Example: Moving on-premises services to the cloud
Emergency changes: Emergency changes have high impact and urgency, requiring expedited assessment, approval, and implementation to get services up and running as soon as possible.
Examples: Primary server failure, data center disruption, emergency patch for security vulnerability