a foundational result in equivariant commutative algebra is cohen's theorem that the infinite variable polynomial ring \(r=\mathbb{c}[x_1,x_2,\ldots]\) is noetherian up to the action of the infinite symmetric group. this has been applied to prove uniformity results for finite-dimensional structures in algebraic geometry, statistics, and algebraic topology, and motivates the study of other aspects of the equivariant commutative algebra of \(r\). in this talk, we explain an approach to developing the local theory of \(r\)-modules in this equivariant setting by studying a generalization of fi-modules to a "weighted" setting. we introduce these weighted fi-modules, and discuss how they too can be studied from the perspective of commutative algebra up to the action of parabolic subgroups of the infinite general linear group.