The present study explores a child L2 novice's emergent interactional competence during her first year in a Swedish immersion classroom. Within the theoretical framework of situated learning it focuses on how the novice acquires expertise in a specific classroom practice: multiparty classroom talk. The data cover three periods (the early, mid-, and late phase) of her first school year. The methods adopted combine a microanalytic approach with ethnographic fieldwork analyses of L2 socialization within a classroom community.The analyses revealed systematic changes in the novice's interactional engagements. An interplay of language skills and turn-taking skills influenced her participation in multiparty talk during the three periods, casting her as (i) a silent child, (ii) a noisy and loud child, and as (iii) a skilful student. These changes indicate that learning cannot be seen as a unilinear development of a single learner identity. It is argued that a detailed longitudinal analysis may provide important insights into the relation between participation and L2 learning. Instead of unilinear development of a single 'learner' identity we may find different participation patterns linked to distinct language learning affordances over time.Key words: interactional competence, children 's L2 learning, language competence, turn-taking, learner identity.Schooling is a significant part of children's everyday life, and socialization into the interactional management of classroom talk (e.g., turn design in a competitive multiparty classroom setting) 2 constitutes an essential part of children's 'learning lessons', their ways of becoming competent members of a classroom community (Mehan, 1979).1 As demonstrated by second language (L2) ethnographies, participation in social activities in the classroom is related to second language acquisition and socialization (e.g., Bayley & Schecter, 2003;Duff, 1995;Hall 1998;Morita, 2000; Willet, 1995). L2 learning, therefore, needs to be studied in relation to the novice's interactional management of classroom activities.The present ethnographically oriented study tracks an L2 novice's participation in an immersion classroom. Using a longitudinal design, it explores a 7-year-old Kurdish girl's emergent interactional competence during her first year in a language classroom. Interactional competence involves a range of skills for using language to accomplish social actions, including social aspects of language use such as knowing when, how, and with whom to engage in conversational activities (Hymes, 1972;Schegloff et al., 2002). In the present study it is defined as participants' knowledge of the interactional architecture of a specific discursive practice, including knowing how to configure a range of resources through which this practice is created (Young & Miller, 2004, p. 520;Hall, 1999). It entails knowledge of linguistic resources constituting particular activities (the lexis and syntactic structures) (Young & Miller, 2004), pragmatic skills, such as topic introduction and maintena...