Theories at different levels of organisation can co-evolve such that corrective modifications are made to both them so that eventually some degree of reduction of one to other becomes possible. A central concept in Patricia S. Churchland‚was attempt to defend the merits of reductionism in science, especially between psychology and neuroscience, and expounded in her book Neurophilosophy (1986)
. See Reductionism, Theoretical pluralism