Usooli and AkhbariShiaTwelverMuslims believe that the study of Islamicliterature is a continual process, and is necessary for identifying all of God's laws. Twelver Shia Muslims believe that the process of finding God's laws from the available Islamic literature will facilitate in dealing with any circumstance. They believe that they can interpret the Qur'an and the Twelver Shi'a traditions with the same authority as their predecessors. This process of ijtihad has provided a means to deal with current issues from an Islamic perspective. Generally, the Twelver Shi'a clergy have exerted much more authority in the Twelver Shi'a community than have the Sunni ulema.
Most Sunni scholars, preachers, and judges (collectively known as the Sunni ulema) traditionally believe that the door of ijtihad, or private judgment, needs to be scrutinized by equal counterparts of learned scholars in order for it to be accepted, and needs to be applied solely to matters that do not have a clear dictation in the Quran or the Hadith. Sunni Muslims consider that Sunni scholars had studied the Qur'an and hadith for centuries, during which time they developed the four schools of law (madhhab), and that the height of Islamic knowledge was reached at this time, thus these teachings should be given the highest regard.
The term Dāˤī al-Mutlaq (Arabic: الداعي المطلق) literally means "the absolute or unrestricted missionary". In Ismā'īlīIslām, the term dāˤī has been used to refer to important religious leaders other than the hereditary Imāms and the Daˤwa or "Mission" is a clerical-style organisation. "The Daˤwa" was a term for the Ismā'īlī faith itself from early on. They are also called Dāˤī Syednas.