 Other approaches to realization appeal to other specific relations. As noted above, one might endorse an account of weak emergence in terms of determination through the assumption that instances of determinables are token-identical to instances of their realizing determinates. But one might adopt this general approach while rejecting the assumption of token identity, either on grounds that determinable tokens as well as types have less specific essences than associated determinate tokens and types (Yablo 1992) or on grounds that determinable tokens as well as types are associated with fewer powers than associated determinate tokens and types (Wilson 1999, 2015). Yet another approach to realization is based in the part-whole relation, with higher-level types and tokens taken to be proper parts of lower-level types/tokens (Shoemaker 2000 [2001], Clapp 2001). Common to these particular strategies is the idea that token and type powers of a realized feature are a (non-empty) proper subset of the token or type powers of the lower-level physical feature upon which it depends (Wilson 1999, 2015). Causal autonomy can result from a higher-level feature’s having fewer, not more, powers than the feature upon which it depends because the latter encodes distinctive difference-making (e.g., if one’s neurological state had been slightly different, one would still have been thirsty and still have reached for the glass).