The process of coming up with a new ruling (hukm) for which there is presently no specific illah or effective cause available under a proper characterization (wasf). This involves establishing illah based on ijtihad (analogy based reasoning). For example, takhrij is applied for the prohibition of riba that arises in the exchange of wheat or rice because it is makil (an element measurable by weight) of a genus or a food element of a genus (a category such as food items, or matoomat /edibles).

Ijtihad qiyasi (اجتهاد قياسي) is a branch or part of ijtihad (reasoning).

It is also known as takhrij al-manat.