 Despite the detail in which Feldman characterizes the concept of basic intrinsic value, he offers no strict analysis of it. Others have tried to supply such an analysis. For example, by noting that, even if it is true that only states have intrinsic value, it may yet be that not all states have intrinsic value, Zimmerman suggests (to put matters somewhat roughly) that basic intrinsic value is the intrinsic value had by states none of whose proper parts have intrinsic value (Zimmerman 2001, ch. 5). On this basis he argues that disjunctive and negative states in fact have no intrinsic value at all, and thereby seeks to show how all intrinsic value is to be computed in terms of summation after all.