| Software Fault Severity Level | Contents |
| Blocker | The fault is the most serious in all of fault levels. |
| Critical | This fault is more serious fault comparably but is less serious than blocker. |
| Major | This level shows that most of certain functions in software are malfunction. |
| Normal | This fault level is general one. |
| Minor | The fault happens in minor functions of software. |
| Trivial | The fault is minor one that has less effectiveness to the function in software. |
| Enhancement | This level is not fault itself generally but is requested to be revised. |