As nouns the difference between ijma and ijtihad is that ijma is (islam) the consensus of the muslim community while ijtihad is (islam) the process of muslim jurists making a legal decision by independent interpretation of the qur'an and the sunna; such a jurist is a mujtahid.
Relied more on Qiyas, The Ijma which are consistant with Quran and Sunnah, iv. Zaif and Mursal traditions; The difference between them is more of a degree than of nature.

More specific sources discussing the methodologies below can be found by searching these terms: ijma, qiyas, istihsan, istihab, urf. Ijma (general consensus of opinion from among the companions of Muhammad or the learned scholars) Qiyas (analogical reasoning/deduction) Istihsan (juristic preference to ensure equity/public interest)

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Ijma of the Jurists: This was the unanimous decision of the jurists (other than companion). What are the pillars of qiyas? The qiyas pillar consists of: (1) legal origin; (2) branch as the focus of polemic whether it raises the law or not; (3) law and (4) 'illat which includes origin and branches. What is difference between ijma and ijtihad?

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difference between ijma and qiyas