In this article, author has tried, based on a comparsion between meaning of classification with meaning of inequality, to reach a particular definition of classification which elements such as social ineguality could be recognized Within it. Although, at the first glance, ineguality could be seen as a natural phnenomenon, or as a genetice one, studies have proved that classification in societies such as slavery and cast system are the main source of social inequality. Author believes that Imam Ali did not opposse the
essence of classification, but he was strongly oppossing with instituionalization of it. Therefore any leftist and radical interpretation of Islam is wrong. Classificational modal in Imam Ali`s thoughts has combined elements of private authority , agreement for being rich, and answering peopl`s needs according to ability of society.
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