Habermas' recent work makes a major claim, that is to be able to determine what is the most rational thing to do. Postmodernists, notably Lyotard, have perhaps successfully belittled this claim as too positivistic. However it is difficult to see their work as offering more than sheer irrationality as the supposed alternative to Habermas. This book does not dispute the validity of the postmodern critique but it is concerned to resist the irrationality which, thus far, seems to coincide with anti-positivism. The concept utilized in this book is one of justice, a concept that the author uses to demonstrate the theories of both Habermas and Lyotard.