 The followers of ""Batiniyyah-Twelver" madh'hab" consist of Alevis and Nusayris, who developed their own fiqh system and do not pursue the Ja'fari jurisprudence.Their combined population is nearly around 1% of World overall Muslim population.Alevis are sometimes categorized as part of Twelver Shia Islam, and sometimes as its own religious tradition, as it has markedly different philosophy, customs, and rituals.