 Considerations of this sort have been presented by a number of theorists (see e.g., Hodgson 2007; Jackson and Pettit 1992a; Jones 1996; Tannsjö 1990). It should be noted that the regress argument makes a purely negative point in that it offers no guidance as to when—and why—holist explanations are indispensable in the social sciences as they are currently practiced. In this respect, the argument differs from the others considered in this section.