Anarchism employs a diversity of tactics in order to meet its ideal ends which can be broadly separated into revolutionary and evolutionary tactics. There is significant overlap between the two which are merely descriptive. Revolutionary tactics aim to bring down authority and state, having taken a violent turn in the past. Evolutionary tactics aim to prefigure what an anarchist society would be like. Anarchist thought, criticism and praxis have played a part in diverse areas of human society. Criticisms of anarchism include claims that it is internally inconsistent, violent, or utopian.