 Marx’s second argument rests on an epistemological claim that that utopian plans and blueprints are impossible, because they require accurate knowledge of the future of a kind which cannot be had. The basic argument starts from the assumption that to be of any use a blueprint must facilitate the construction of a future socialist society. Moreover, to facilitate the construction of a future socialist society a blueprint must be completely accurate; and to be completely accurate a blueprint must predict all the relevant circumstances of that future society. However, since it is not possible—given the complexity of the social world and the limitations of human nature—to predict all the relevant circumstances of that future society, we can conclude that socialist blueprints are of no use. One central reason for resisting this argument is that, whilst it is hard to deny that completely accurate plans are impossible (given the complexity of the world and the limitations of human understanding), the claim that only completely accurate plans are useful seems doubtful. Plans are not simply predictions, and providing less than wholly accurate plans for ourselves often forms part of the process whereby we help determine the future for ourselves (insofar as that is possible).