The first and most noted strand of radical democracy is the agonistic perspective, which is associated with the work of Laclau and Mouffe. Radical democracy was articulated by Ernesto Laclau and Chantal Mouffe in their book "Hegemony and Socialist Strategy: Towards a Radical Democratic Politics", written in 1985. They argue that social movements which attempt to create social and political change need a strategy which challenges neoliberal and neoconservative concepts of democracy. This strategy is to expand the liberal definition of democracy, based on freedom and equality, to include difference.