The Situationist International Anthology assembles one of the twentieth century’s most incisive attempts to fuse avant-garde practice, urban critique and revolutionary theory. The iconic idea is the construction of situations: the deliberate reorganisation of everyday life against spectacle, commodity passivity and functionalist urbanism. Its theoretical contribution is to transform art from object-production into a tactical intervention in lived experience, where dérive, détournement, unitary urbanism and critique of the spectacle operate as linked concepts. Methodologically, the anthology proceeds through manifestos, journal texts, internal documents and insurgent urban propositions, producing theory as agitation rather than detached interpretation. Its conceptual operation is experiential politicisation: streets, images, slogans and behaviours become materials of social transformation. The bridge to the wider field connects Marxism, urban theory, performance, media critique, psychogeography and postwar avant-garde history.