This project seeks to investigate ideologies of linguistic differentiation among the Sundanese of West Java, the second largest ethnic group in Indonesia. With Indonesia's nation-statist project undergoing a profound reexamination since the end of President Soeharto' s three decades of rule, my research on the sociopolitics of Sundanese language use comes at a time when many Sundanese are rekindling debates on their vernacular language and its importance to regional and national spheres. Through a fine-grained analysis of linguistic interaction in two fieldsites in the Priangan and Karawang regions, I hope to determine how Sundanese speakers position themselves and others by drawing internal and external linguistic boundaries. Such boundary-making may reveal competing conceptualizations of Sundanese-ness - and Indonesian-ness - currently at play throughout West Java, opposing "traditional" models of normative refinement with "modem" egalitarian ideals.