Human language and cognition do not develop independently of each other but are intricately intertwined in various ways. This contribution presents the interplay between linguistic and cognitive abilities of learners at the individual level and relates them to the level of external contextual factors in social and educational environments. In…

Using input and outcome data from a randomized study of dual-language immersion programs in an urban district, we examine the mediating relationships of dosage, expenditures, and classroom characteristics to students' academic performance, and the moderating role of students' race/ethnicity. Differential costs of immersion were concentrated at the…

Professional development is central to teacher competence and, with particular attention to larger-scale, structured and formal professional development interventions (PDIs), this article discusses how the impact of professional development can be conceptualized and evaluated. Various kinds of impacts on teachers, organizations and systems, and…