Introduction: the limits of institutions in multiethnic societies -- 'National self-determination': federalism the Ethiopian way -- The historical trajectories of local ethnic polities: the Sidama and the Wolayta -- Ethnic politics in play: implementing self-determination in a South Ethiopian context -- Crafting ethnic politics: the formation of parties in Sidama and Wolayta -- Dealing with local minorities: the persistence of discriminatory practices under ethnic federalism -- Identities or resources at stake? controversies on national self-determination in Sidama and Wolayta -- Conclusion: the facets of ethnic federalism.