| Testing items | Key integration | Important integration | Unimportant integration | |
| Code review | Desk check, etc. | Obliged | Obliged | Obliged |
| Data testing | Process boundary | Obliged | Obliged | Needed |
| Format & interface | Obliged | Obliged | Needed | |
| Safety | Obliged | Obliged | Obliged | |
| Functin and state testing | 0-switch requirement | Obliged | Obliged | Needed |
| N-switch requirement | Actual situation | Actual situation | Actual situation | |