How do you distinguish the importance of a problem from its criticality level?

The importance and severity are different concepts in testing and quality management:

• Importance reflects how much the problem affects business processes or the user. For example, a bug that hinders a key function will have high importance.

• Severity indicates how seriously the problem impacts the system's operation from a technical perspective. For example, a system crash or data loss — high severity.

Example:

• A typo on a button — low severity, low importance.
• Inability to place an order — high importance and high severity.

Thus, importance is related to business value, while severity relates to the technical impact on the system.