Juristic and hermeneutic principles are based on common sense, not on the directives and commandments of the Shari`ah . The principle of Qiyas [1] is based on the simple common sense principle that the same directive would follow for two similar situations. I hope this helps. Moiz Amjad March 17, 2005 [1] Determining the suitability or otherwise of one thing or situation about which there is no express directive of the Shari`ah , through analogy with a similar thing or situation about which the Shari`ah has given an express directive. Answer published by Moiz Amjad Discussion(s) regarding this Question A Further Exchange on the Proof of Qiyas