This summary provides an overview of the evolution of social theories from modernism to postmodernism. Modernism was characterized by Enlightenment thinking that emphasized unity, objective science, universal morality and reason as driving humanity towards a common goal. Later modernists acknowledged more fragmentation but still believed in linear progress and rational social orders. Postmodern theorists like Lyotard rejected grand narratives and argued that knowledge is produced locally through diverse language games rather than being a tool for authorities. The document traces this shift from theories of a unified social reality and global understanding to pluralistic theories embracing local networks and differences.