 A determinable-based approach to realization is subject to two main concerns (besides those generally targeting a powers-based account;  see §3.5),  each aiming to show that realization cannot be determination, since realization lacks some key feature of determination (see Ehring 1996; Funkhouser 2006, 2014; Walter 2007; and Worley 1997). First is the argument from mental multiple realizability, according to which such realizability effectively violates Determination ‘in respect of’ determinables (entailing that determinates differ in respect of determinables), since 