Organization: Institute of Education Sciences, What Works Clearinghouse
The goal of this practice guide is to offer educators specific, evidence-based recommendations that address the challenges of teaching students in grades 6–12 to write effectively. This guide synthesizes the best publicly available research and shares practices that are supported by evidence. It is intended to be practical and easy for teachers to use.
http://ies.ed.gov/ncee/wwc/Docs/practiceguide/wwc_secondary_writing_110116.pdf