| Kind of Changes | Severity | Count | Percentage |
|---|
| Removing functions from the library | High | 29735 | 43.63% |
| Changing virtual table structure | High | 805 | 1.18% |
| Changing the number or order of parameters | Medium | 1414 | 2.07% |
| Changing type of a parameter | destructive* | Medium | 10508 | 15.42% |
| non-destructive | Low | 13866 | 20.34% |
| Changing type of return value | destructive | Medium | 1308 | 1.92% |
| non-destructive | Low | 2438 | 3.58% |
| Adding/removing “static” specifier of a method | Medium | 15 | 0.02% |
| Changing Values in Enumeration Types or Macros | Low | 7231 | 10.61% |
| Overriding Virtual Functions | Low | 837 | 1.23% |
