 A second concern with a powers-based approach is that, in applying only to broadly scientific goings-on, it doesn’t make sense of determination as holding between abstracta or other entities lacking powers. In response, a proponent of a powers-based account might try to extend the approach beyond specifically causal powers to one involving non-causal functional roles associated with, e.g., being a number (determinable), and being a prime number (determinate). This extension remains speculative, however; at present the account is not fully general.