Arevolution (from Late Latin revolutio which means "aturn around") is a significant change that usually occurs in a relatively shortperiod of time. Variously defined revolutions have been happening throughouthuman history. They vary in terms of numbers of their participants(revolutionaries), means employed by them, duration, motivating ideology andmany other aspects. They may result in a socio-political change in thesocio-political institutions, or a major change in a culture or economy.Scholarly debates about what is and what is not a revolution centeraround several issues. Early study of revolutions primarily analyzed events inEuropean history from psychological perspective[citation needed], soon howevernew theories were offered using explanations for more global events and usingworks from other social sciences such as sociology and political sciences.Several generations of scholarly thought have generated many competing theorieson revolutions, gradually increasing our understanding of this complexphenomenon