This study investigates phenomena that have been claimed to be indicative of Specific Language Impairment (SLI) in German, focusing on subject–verb agreement marking. Longitudinal data from fourteen German-speaking children with SLI, seven monolingual and seven Turkish–German successive bilingual children, were examined. We found similar patterns of impairment in the two participant groups. Both the monolingual and the bilingual children with SLI had correct (present vs. preterit) tense marking and produced syntactically complex sentences such as embedded clauses and wh-questions, but were limited in reliably producing correct agreement-marked verb forms. These contrasts indicate that agreement marking is impaired in German-speaking children with SLI, without any necessary concurrent deficits in either the CP-domain or in tense marking. Our results also show that it is possible to identify SLI from an early successive bilingual child's performance in one of her two languages.

NWR and SR tasks informed by linguistic theory are appropriate for use as part of the diagnostic process for identifying language impairment in bilingual children for whom the language of assessment is different from the home language, in diverse sociolinguistic contexts.

This study investigates verbal morphology in Specific Language Impairment (SLI) in German, focusing on past participle inflection. Longitudinal data from 12 German-speaking children with SLI, six monolingual and six Turkish-German sequential bilingual children, were examined, plus an additional group of six typically developing Turkish-German sequential bilingual children. In a recent study (Rothweiler, M., Chilla, S., & H. Clahsen. (2012). Subject verb agreement in Specific Language Impairment: A study of monolingual and bilingual German-speaking children. Bilingualism: Language and Cognition, 15, 39-57), the same children with SLI were found to be severely impaired in reliably producing correct agreement-marked verb forms. By contrast, the new results reported in this study show that both the monolingual and the bilingual children with SLI produce participle inflection according to their language age. Our results strengthen the case of difficulties with agreement as a linguistic marker of SLI in German and show that it is possible to identify SLI from an early sequential bilingual child's performance in one of her two languages.

Language disorders, and Specific Language Impairment (SLI), have been extensively studied in a number of different, though thus far almost exclusively Indoeuropean, languages. For other languages such as Turkish, Vietnamese, or Arabic, however, findings on the outcome of SLI are rare. In this context, the growing number of migrant children in European countries with a variety of first languages can be seen as a challenge to linguistics and to language assessment: The lack of empirical findings on SLI in these languages brings up the question of how the impairment is manifested in bilingual children with a migrant background. In order for a language disorder to correctly be labelled SLI, it needs to be identified in both languages. This paper presents findings from a study examining the grammatical features of Turkish first language acquisition in Germany, while focusing on Turkish case morphology. For this purpose, it compares the data of three typically-developing children and two children with deviant language development. Moreover, it presents a first interpretation of the outcome of grammatical SLI in bilingual Turkish children and discusses suggestions for diagnostic assessment procedures.

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