Usûlî Kıyasın Bilgi ve Amel Değeri

The value of knowledge and deeds of the methodology of the reasoning defined such as "due to they have a common effective cause ('illa), the provision of principle (aşi) is given to the branch (far ')" has been the subject of debate from the first period. That is, on the one hand there are some who reject the method of analogical reasoning by saying that although the authority of legislation belongs to Shâri'only, this method is to make legislation in the religion and that its value in knowledge is condemned as conjecture by the injunction (naşş). They also put forward some arguments as well. However, on the other hand the majority accepts the method of reasoning as an essential and shar'ī (religious) argument. This study will not compare the opinions of those who reject qiyās and that of those who approve it. By means of religious and rational evidences this study will deal with that the method of analogical reasoning is not a rational effort simply, that the knowledge gained by it is not a conjecture criticised by the injunctions, that it is the highest ranking conjecture based on the proof, and that it is sufficient to practice in the field of law. After a general frame is drawn about qiyās, this article has been limited with the place of qiyās in the hierarchy of evidence and its value concerning knowledge and practice. This article wants to clarify the discussions related to the value of knowledge and deeds of the methodology of the reasoning.