 Lewis’s reason for focusing on this toy theory involves a debate with Putnam  (1980).  Putnam had argued that the only admissible interpretations of a population in possession of an “empirically ideal” theory are interpretations under which that theory is true (see entry  challenges to metaphysical realism,  §3.5). As Lewis reconstructs Putnam’s argument, his premise is a theory similar to the toy theory except that “use” is the only admissibility-determining factor. Lewis offers the use-plus-eligibility theory as a minimal fix, and as an illustration of the way in which the concept of naturalness can be a helpful resource in formulating reductive theories of content which avoid strange  consequences.[49]