  The (U)-Principle assumes that valid moral rules or norms allow for an egalitarian community of autonomous agents—as Kant put it, a “systematic union of different rational beings” governed by “common laws” (1785, Ak. 433; also 431). However, the (U)-Principle has been a site of controversy among discourse theorists, and not everyone considers it necessary for a discourse ethics (Benhabib and Dallmayr 1990; Wellmer 1991; Gottschalk-Mazouz 2000). Some feminist proponents of an "ethics of care" have worried that Habermas's neo-Kantian model of universalization screens out morally relevant particularities of concrete situations and persons (Young 1990; Benhabib 1992, chap. 5).