In his magnum opus "Theone des kommunikativen Handelns", the distinguished philosopher Jurgen Habermas presented his ideas as a whole, providing the first major defense of his philosophy. David Ingram here summarizes the themes of Habermas's masterwork, placing them in the context of the philosopher's other work, relating them to poststructuralism, hermeneutics, and Neo-Aristotelianism, and surveying what other critics have said about Habermas