What severity level would represent a bug causing a system crash?

A bug that causes a system crash represents the highest level of severity, commonly classified as Severity 1. This classification indicates a critical issue that has a significant impact on operations, rendering the system unavailable or inoperable. In such cases, immediate attention is required to resolve the issue, as it affects all users or critical business functions. Priority for resolution is typically the highest level due to the direct impact on the organization’s ability to perform essential tasks.

Severity levels are generally defined in a hierarchical manner where Severity 1 represents emergency situations, while lower severity levels, such as Severity 2, 3, and 4, correspond to less critical issues that do not halt business operations. These lower levels may involve bugs that are annoying or impair certain functionalities but do not critically affect overall operations.