Abstract
Polger and Shapiro have two principal takes on realization: An individual being a member of a kind is an instance of realization, and a kind being a member of a kind is an instance of realization. Both of these conceptions of realization suffer from serious objections. The broader conclusion that emerges from these many flaws is that, while their versions of realization and multiple realization are implausible, this does nothing to undermine the viability of more recent versions of nonreductive physicalism based on property instances.