This school of thought utilizes ijtihad by adopting reasoned argumentation in finding the laws of Islam. Usulis emphasize the role of Mujtahid who was capable of independently interpreting the sacred sources as an intermediary of the Hidden Imamas and thus serve as a guide to the community. This meant that legal interpretations were kept flexible to take account of changing conditions and the dynamics of the times. This school of thought is predominant among most Shia. Ayatollah Ruhollah Khomeini emphasized that Ja'fari jurisprudence is configured based on the recognition that epistemology is influenced by subjectivity. Accordingly, Ja'fari jurisprudence asserts Conventional Fiqh and Dynamic Fiqh. Through Dynamic Fiqh, discussed in the famous text by Javaher-al-Kalem, one must consider the concept of time, era, and age as well as the concept of place, location and venue since these dimensions of thought and reality affect the process of interpreting, understanding and extracting meaning from the commandments.
Akhbari
This school of thought takes a restrictive approach to ijtihad. This school has almost died out now; very few followers are left. Some neo-Akhbaris have emerged in the Indian subcontinent, but they do not belong to the old Akhbari movement of Bahrain.
Bada
Twelvers, along with other Shia sects such as the Zaydis, reject predestination. This belief is further emphasized by the Shia concept of Bada’, which states that God has not set a definite course for human history. Instead, God may alter the course of human history as is seen to be fit.
Nikah Mut'ah
Nikah mutʿah," is a type of marriage used in Twelver Shia Islam, where the duration of the marriage and the dower must be specified and agreed upon in advance. It is a private contract made in a verbal or written format. A declaration of the intent to marry and an acceptance of the terms are required. Zaidi Shias, Ismaili Shias, and Sunni Muslims do not practice nikah mut'ah.
Taqiyah
In Shia Islam, taqiya is a form of religious veil, or a legal dispensation whereby a believing individual can deny his faith or commit otherwise illegal or blasphemous acts, specially while they are in fear or at risk of significant persecution. Once source for this understanding comes from al-Kafi. This practice was emphasized in Shi'a Islam whereby adherents may conceal their religion when they are under threat, persecution, or compulsion. Taqiyya was developed to protect Shi'as who were usually in minority and under pressure, and Shia Muslims as the persecuted minority have taken recourse to dissimulation from the time of the mihna under Al-Ma'mun in the 9th century, while the politically dominant Sunnites rarely found it necessary to resort to dissimulation.
