Miyuki Takeuchi Department of Second Language Studies Indiana University Dissertation Proposal: "The investigation of form-function mappings: Referential expressions and encoding of referential status in L2 narrative discourse by L1-English learners of Japanese" The acquisition of referential expressions, including particles, is one of the most challenging tasks that learners of Japanese face. The goal of the present study is to find what the referential systems of learners at each developmental stage are, how the systems undergo change with increased input and instruction, and whether and how leaners attain the target norms. To investigate these, L1-English learners of five different proficiency levels (N=75) are recruited, and they do two kinds of narrative tasks. The use of nominative referential forms in the narratives, NP-ga (nominative marker), NP-wa (topic marker), and null anaphora are analyzed with respect to the discourse functions that these forms serve, i.e., encoding of referential (information) status. The pilot study found (a) relatively early acquisition of null anaphora, (b) overuse of NP-wa at the early stage, (c) delayed emergence of NP-ga, and (d) residual indeterminancy of the distinctive use of NP-ga and NP- wa. The present study attempts to build on these findings to reveal more comprehensive processes of the acquisition and causes of the challenges that learners may be facing. In addition to the investigation of learners' narratives, the textbooks used in the institution where the informants were recruited are analyzed as to how much and in what functions NP-ga, NP-wa, and null anaphora are introduced in the texts. This serves as a data base for the discussion of possible relations between class input and learners' performance. Based on the findings, pedagogy will be developed for more effective instruction of Japanese referential expressions.