 Worley (1997) sketches a different sort of a constitution-based account, as a way of supplementing Yablo’s (1992) asymmetrical necessitation account. She illustrates with triangularity, analyzed as involving the constituent features associated with being a closed, three sided plane figure, which features can vary in ways associated with equilateral, isosceles, and scalene triangles, among others. Worley sees this as motivating a model of determination on which “the constituents of each determinable are proper subsets of the constituents of each of their determinates”, such that, e.g., the determinable triangular and the determinate equilateral triangular would share features such as three-sided and closed plane figure, but the latter would be additionally constituted by equilateral. As Worley observes, this account accommodates various features of determination, including Determinable inheritance: 