Advocates of one or another set of institutions for new democracies have typically neglected the question of adoptability. The omission is especially evident in institutional prescriptions for the reduction of ethnic conflict in severely divided societies. These have been advanced with little regard for obstacles likely to be encountered in the process of adoption. Yet adoption is problematic. Processes of negotiation and exchange open the possibility of mixed outcomes reflecting the asymmetric preferences of majorities and minorities. The Northern Ireland Agreement of 1998, however, is a glaring exception, for it produced institutions that are intended to be clearly and consistently consociational. An examination of the process by which the agreement was produced suggests that the coherent outcome in Northern Ireland was the result of some very special conditions conducive to a consensus on institutions that spanned party lines. These conditions are unlikely to be widely replicable, and the fact of consensus does not imply that the agreed institutions are apt for the divided society whose problems they are intended to ameliorate.