Reasoning and Ways of Detection Ratio in Analogical Argument; Comparative Study in Islamic Law and Common Law

Ratio (or reasoning) is the fundamental section of the analogical reasoning. According to Islamic jurisprudence, if the reason is known, the analogical reasoning is authorized. So they have tried to initiative the ways to obtaining the rules reason. Common law system is also based on definition of the judgment reason. According to common law thoughts, it is not enough to achieve similarities but it also should detect the ratio of decisions. Judges distinguish between the ratio of decisions and obiter dicta. It clearly shows that there are common concerns at both the of Islamic law and common law systems.