1. According to the Akhbaris and Usulis, the famous schools of twelver legal practice over the last four centuries, between shi'ism and sunnis, there is a difference what they regard as the sources of authority. Shi'is think that Quran and the prophetic sunna are the authority like Sunnis. In addition Shi'is accept the reports of the imams. The twelver legal practice and Sunni doesn't differ radically. Shi'is has the particular tax system unlike Sunni or the twelver legal practice.

2.  I found what sunna meant. Sunna has been refered especially after the birth of Islam to as the norms the prophet Muhammad indicated since what the prophet Muhammad said and did became to be thought important for Muslim.

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