Gender Trouble: Feminism and the Subversion of Identity (1990; second edition 1999) is a book by the philosopher Judith Butler in which the author argues that gender is a kind of improvised performance. Summary Butler criticizes one of the central assumptions of feminist theory, that there exists an identity and a subject that requires representation in politics and language. For Butler, "women" and "woman" are categories complicated by factors such as class, ethnicity, and sexuality. Moreover, the universality presumed by these terms parallels the assumed universality of the patriarchy and erases the particularity of oppression in distinct times and places. Butler thus eschews identity politics in favor of a new, coalitional feminism that critiques the basis of identity and gender. They challenge assumptions about the distinction often made between sex and gender, according to which sex is biological while gender is culturally constructed. Butler argues that this false distinction introduces a split into the supposedly unified subject of feminism. Sexed bodies cannot signify without gender, and the apparent existence of sex prior to discourse and cultural imposition is only an effect of the functioning of gender. Sex and gender are both constructed. Examining the work of the philosophers Simone de Beauvoir and Luce Irigaray, Butler explores the relationship between power and categories of sex and gender. For de Beauvoir, women constitute a lack against which men establish their identity; for Irigaray, this dialectic belongs to a "signifying economy" that excludes the representation of women altogether because it employs phallocentric language. Both assume that there exists a female "self-identical being" in need of representation, and their arguments hide the impossibility of "being" a gender at all. Butler argues instead that gender is performative: no identity exists behind the acts that supposedly "express" gender, and these acts constitute, rather than express, the illusion of the stable gender identity. If the appearance of “being” a gender is thus an effect of culturally influenced acts, then there exists no solid, universal gender: constituted through the practice of performance, the gender "woman" (like the gender "man") remains contingent and open to interpretation and "resignification". In this way, Butler provides an opening for subversive action. They call for people to trouble the categories of gender through performance. Discussing the patriarchy, Butler notes that feminists have frequently made recourse to the supposed pre-patriarchal state of culture as a model upon which to base a new, non-oppressive society.