From site:
Effective Literacy and English Language Instruction for English Learners in the Elementary Grades: A Practice Guide
This Practice Guide was developed by an expert panel convened by the Institute of Education Sciences. It offers a set of five research-based recommendations that together constitute a coherent approach to a multifaceted problem. A summary of the research evidence and a level of evidence rating are provided for each recommendation. This Practice Guide is the foundation for all the Doing What Works content on teaching literacy to K-5 English learners.
