Assessing vocabulary knowledge is an important part of establishing language proficiency in bilingual children. The crosslinguistic lexical tasks (CLTs) provide a framework for testing vocabulary development in three-to-six year-olds using a standard procedure and comparable items for multiple languages. This study describes the development of the…

Presents a longitudinal examination of the effects of certain types of schooling (bilingual, immersion, mixed-language) on the concept development of monolingual, developing bilingual, or competent bilingual children in Wales. Results indicated that immersion programs temporarily retarded concept development of second language beginners.…