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…

A question commonly raised by teachers is the extent to which task-based language teaching (TBLT) is suitable for young beginners, but to date, very little research has examined how TBLT can be implemented with complete beginners. The purpose of this article is to document my attempt to introduce a task-based approach in order to see if such an…

Examines whether second-language (L2) learners' interaction with other L2 learners can address their input, output, and feedback needs for L2 learning in ways interaction with native speakers (NSs) had been shown to do. Results indicate interaction between L2 learners can address some of these needs, but it does not provide as much modified input…