 The latent concepts rendered explicit by the practice of symptomatic reading were said by Althusser to constitute the theory of Dialectical Materialism, or what is the same thing, Marx’s philosophy. With these concepts made explicit, Althusser believed that Marxist science, or Historical Materialism, could employ them in order to achieve better analyses of specific modes of production and better understandings of the opportunities that specific modes of production presented for political change. Some of these concepts have already been articulated in the discussion of the mode of production above, but without being named. To label these concepts and then to add some more, the idea that each individual productive process or element stands in relation to and plays a part of a complexly structured whole, none of which is reducible to being the simple or essential cause of the others, is what Althusser terms the idea of “structural causality.” This concept, in turn, is closely related to the idea of “overdetermination” or the theory that every element in the total productive process constituting a historical moment is determined by all the others.