 It has not proved an easy thing for philosophers to understand what Wittgenstein means here (see Albritton 1959; Shoemaker 1963; Kenny 1967; Baker 1974). What one can say is that a criterial relation between mind and behavior is designed to be distinct from, on the one hand, logical entailment, and on the other, inductive inference. Some see a connection between a criterial relation here and the possibility of perceptual knowledge of another’s mind (McDowell 1982, Hacker 1997; see  §1.4.1).  Those that advocate a criterial relation between mind and behavior also tend to understand the problem of other minds to be a conceptual one (see  §2).  As well as being associated with the rejection of a certain conception of mind that can be labeled ‘Cartesian’, appeal to a criterial relationship between mind and behavior is often thought to form part of an anti-sceptical stance in connection with others.