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Methodology is a major issue in all the fields covered by science. In Islamic jurisprudence, the jurist who uses his personal judgment (i.e. the mojtahed) rely on the principle of inference (estenb?t). This method can give great results, but they will be even greater if the mojtahed had himself a specialization in the domain concerned. This kind of specialization is not new: it was called (tajazzi) before and its principle has been accepted by most of the shi’i and Sunni authorities. As sciences are divided in numerous branches, so must be the mojtaheds. The more science expands, the more it requires specialization. And such a specialization is at the same time the cause and the consequence of the progress of science. This new trend is not contradictory with the principles of Islamic jurisprudence.