Abstract: A system and method for selective regression testing is described. The system and method provides a test script database identifying multiple portions of a first low level code (e.g., assembly code) and tests associated with at least one of the multiple portions of first low level code. A comparator may identify a change set between the multiple portions of the first low level code and corresponding portions of modified low level code. After the database has been queried by a changed set query module, using the identified change set as key, an optimum or reduced test suite is identified from the database, to be run on the modified low level code, thereby to verify the change set.