The process of verification of the existence of illah and effective cause (ratio legis) in an individual case, after having broadly established illah in its own whether by way of nass (main source text) or ijmaa (consensus) or deduction (istinbat).

In this sense, it refers to the application of a general rule to an individual or specific case (occurrence, event, etc).

Tahqiqul manat, (تحقيق المناط), (also spelled tahqeequl manat or tahqiq al-manat) is a branch or part of ijtihad (reasoning as a source of shari’ah).