Abstract: Contemporary metaphysics is a multi-faceted enterprise, enriched by a plurality of approaches that often lead to methodological conflicts. A central conundrum concerns the boundaries of realist metaphysics when the social world is the focus of theorising. The traditional definition of realism precludes social reality from having the relevant kind of objective joints that social metaphysicians aim to track. Although the debate has so far targeted the `objectivity’ component of standard realism, centring around notions like fundamentality or mind-independence, I maintain that the determinacy of metaphysical claims—the other core component—also represents an important, yet highly overlooked, locus of contention. The specific aim of this paper is to explore how worldly social indeterminacy could represent a compelling phenomenon motivating a revision of the determinacy component of traditional metaphysics. To this end, I distinguish between two kinds of constructional indeterminacy, `product’ and `process’ indeterminacy, and explain their respective meta-metaphysical demands. Albeit both viable options, I argue that process indeterminacy is more compelling because less committal and revisionary. Interactive kinds, whose existence is widely accepted, are shown to be paradigmatic instances of this type of constructional indeterminacy.