Bilingual and Home Language Interventions With Young Dual Language Learners: A Research Synthesis.

Purpose: The purpose of this systematic review was to determine what bilingual or home language interventions have been found to be effective for 2- to 6-year-old dual language learners who have language impairment (LI) or are at risk for LI.

Method: We conducted ancestral searches and searches of electronic databases, hand-searched article bibliographies, and searched 19 journals for experimental, quasiexperimental, or single-subject studies.

Results: The review yielded 26 studies that were coded for quality, frequency and duration of the intervention, number of participants, location of intervention, interventionist, language(s) of intervention, and reported or calculated effect sizes.