Forensic software engineering

Forensic software engineering refers to the discipline of analyzing (and sometimes reconstructing) the functionality of software applications or services that have become defunct; are no longer accompanied by, or previously lacked, documentation; or for which the original engineers are no longer available. == Description == Usually, forensic software engineering is performed with an interest in understanding the functionality - and sometimes intent - of software that has been abandoned by its creators, with an eye to correcting unexpected outcomes or determining whether to port, rebuild, replace, or retire a functional software instance.

Source: Wikipedia — Forensic software engineering (CC BY-SA 4.0)