​Bilingual and L1 interventions for young bilinguals

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This article is a systematic review of 26 studies on bilingual and home language interventions for dual language learners ages 2–6 years and at risk for, or diagnosed with, language impairment. From the reviewed studies, the authors were able to conclude that bilingual and/or L1 interventions can have a positive impact on home language, without negatively impacting the majority language. They also emphasize that SLPs don’t need to be bilingual themselves (speak the child's home language) in order to support these children—there are ways to involve parents and other bilingual staff (e.g. teachers, paras) to help implement interventions.
This paper is perhaps most valuable to the SLP in that it provides you a detailed list of 26 evidence-based interventions for young dual language learners. The authors provide enough information on each study so that the clinician can look through the list, see which studies are most likely to provide relevant information to his/her current caseload, and then look into those studies.

Durán, L.K., Hartzheim, D., Lund, E.M., Simonsmeier, V., & Kohlmeier, T.L. (2016). Bilingual and Home Language Interventions With Young Dual Language Learners: A Research Synthesis. Language, Speech and Hearing Services in Schools. Advance online publication. doi: 10.1044/2016_LSHSS-15-0030.