Ijma

Ijmāʿ (Arabic: إجماع‎) is an Arabic term referring to the consensus or agreement of Islamic scholars on a point of Islamic law. Various schools of thought within Islamic jurisprudence may define this consensus to be that of the first generation of Muslims only; or the consensus of the first three generations of Muslims; or the consensus of the jurists and scholars of the Muslim world, or scholarly consensus; or the consensus of all the Muslim world, both scholars and laymen.

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Zoheir Ali Esmail, Shaykh Zoheir Ali Esmail has a Bsc in Accounting and Finance from the LSE in London, and an MA in Islamic Studies from Middlesex University. He studied Arabic at Damascus University and holds a PhD... Answered 2 years ago

Bismillah

Thank you for your question. When ijma and the aql are included in the sources of Islamic law in the school of Ahl al-Bayt (as) it is with specific terminological meanings that are not the same as other schools of thought. 

Ijma is a source of law if the view of the Imam (as) is included within the view of the community. Not when the community is agreed without the opinion of the Imam (as) being included.

The aql is a source when specific intellectual principles are used that are certain, such as the necessity (wujub) of something dictates the necessity of its introductory aspects. For example, the wujub to make wudu for prayer dictates the wujub of exhausting all means to find water to perform that wudu. Further details of these principles can be found in the books of usul al-fiqh.

May you always be successful.