 Selected Readings: The most detailed statement of Kitcher’s position can be found in Kitcher (1989). Salmon (1989: 94ff.) contains a critical discussion of Friedman’s version of the unificationist account of explanation but ends by advocating a “rapprochement” between unificationist approaches and Salmon’s own causal mechanical model. Woodward (2003) contains additional criticisms of Kitcher’s version of unificationism.