Marx's theory of history is often regarded as the most enduring and fruitful aspect of his intellectual legacy. His "historical materialism" has been the inspiration for some of the best historical writing in the works of scholars such as Eric Hobsbawm, E.P.Thompson, Rodney Hilton and Robert Brenner. S.H. Rigby establishes Marx's claims about social structure and historical change, discusses their use in his own and his followers' writings, and assesses the validity of his theories. He argues that Marx's social theories were profoundly contradictory and that Marxism has proved most useful when it is seen as a source of questions, concepts and hypotheses rather than as a philosophy of historical development.