1-Scope and Importance.2-Historical Background.2.1-In the Period of the Prophet (s).2.2-After the Demise of the Prophet (s).2.3-People of Hadith and People of Opinion.2.4-Translation Movement.3-Main Problems.3.1-Caliphate and the Succession of the Prophet (s).3.2-Faith and the Jurisprudential Ruling of Committing a Major Sin.3.3-Predestination and Free Will.3.4-Divine Word being Incipient or Eternal.3.5-God's narrated attributes.3.6-Divine Justice.4-Branches.4.1-Imamiyya.4.2-People of Hadith and Salafiyya.4.3-Asha'aris.4.4-Maturidis.4.5-Mu'tazilis.4.6-Abadiyya.4.7-Zaydiyya.4.8-Isma'iliyya.5-References.