 Call psychologism the claim that the right way to do logic and theory of rationality more generally is first to figure out how the mind works. Since the early seventies, almost all mainstream work on practical reasoning has been psychologistic in this sense; a representative example might be Michael Smith’s argument for the ‘Humean theory of motivation’, which turns on what desires – a psychological state – are, and how they work (Smith 1987). Vogler’s treatment of practical rationality (Vogler 2002) is a sharp departure from the common approach, and an attempt to replicate in that field the anti-psychologistic turn which Frege and Husserl imparted to work on theoretical rationality in, respectively, the analytic and Continental traditions. She takes herself to be following G. E. M. Anscombe (Anscombe 1985, Vogler 2001), who was in turn following Aquinas. (We won’t take up the historical background to the body of work under discussion here, but see the entry on  medieval theories of practical reason.)