Butler offers a critique of the terms "gender" and "sex" as they have been used by feminists. Butler argues that feminism made a mistake in trying to make "women" a discrete, ahistorical group with common characteristics. Butler writes that this approach reinforces the binary view of gender relations. Butler believes that feminists should not try to define "women" and they also believe that feminists should "focus on providing an account of how power functions and shapes our understandings of womanhood not only in the society at large but also within the feminist movement." Finally, Butler aims to break the supposed links between sex and gender so that gender and desire can be "flexible, free floating and not caused by other stable factors". The idea of identity as free and flexible and gender as a performance, not an essence, is one of the foundations of queer theory.