Constitutivism is a family of theories of normativity, especially in metaethics, that rely on the concept of constitutive norms: norms that are grounded in constitutive features of the kind of thing to which they apply. In this paper, I present two conditions that any constitutivism must meet in its account of constitutive norms, if it is to remain true to its motivations: the constitutivity and broad normativity conditions. I argue that all extant accounts of constitutive norms fail to meet these (...) conditions due to making constitutive norms either inviolable or in need of some external ground of normativity. I then propose a new account of constitutive norms that is better fitted to meet these conditions. This account relies on an analysis of constitutive norms in terms of a specific kind of generic generalization, the “generic proposition”. I explain how norms of this form can be constitutive of a kind, while also allowing for violability. (shrink)