representatives of the community. However, the practical difficulty of obtaining and ascertaining such an agreement meant that it had little impact on legal development. A more pragmatic form of consensus, which could be determined by consulting works of prominent jurists, was used to confirm a ruling so that it could not be reopened for further discussion. The cases for which there was a consensus account form less than 1 percent of the body of classical jurisprudence. Qiyas: It is the Analogical reasoning that is used to derive a ruling for a situation not addressed in the scripture by analogy with a scripturally based rule. In a classic example, the Quranic prohibition of drinking wine is extended to all intoxicating substances, on the basis of the "cause" (ʿilla) shared by these situations, which in this case is identified to be intoxication. Since the cause of a rule may not be apparent, its selection commonly occasioned controversy and extensive debate. Majority of Sunni Muslims view Qiyas as a central Pillar of Ijtihad. On the other hand; Zahirites, Ahmad ibn Hanbal, Al-Bukhari, early Hanbalites, etc rejected Qiyas amongst the Sunnis. Twelver Shia jurisprudence also does not recognize the use of qiyas, but relies on reason (ʿ'Aql) in its place. Ijtihad The classical process of ijtihad combined these generally recognized principles with other methods, which were not adopted by all legal schools, such as istihsan (juristic preference), istislah (consideration of public interest) and istishab (presumption of continuity). A jurist who is qualified to practice ijtihad is known as a mujtahid. The use of independent reasoning to arrive at a ruling is contrasted with taqlid (imitation), which refers to following the rulings of a mujtahid. By the beginning of the 10th century, development of Sunni jurisprudence prompted leading jurists to state that the main legal questions had been addressed and the scope of ijtihad was gradually restricted. From the 18th century on, leading Muslim reformers began calling for abandonment of taqlid and renewed emphasis on ijtihad, which they saw as a return to the vitality of early Islamic jurisprudence. Decision types (aḥkām) Fiqh is concerned with ethical standards as much as with legal norms, seeking to establish not only what is and is not legal, but also what is morally right and wrong. Sharia rulings fall into one of five categories known as "the five decisions" (al-aḥkām al-khamsa): mandatory (farḍ or wājib), recommended (mandūb or