I don't think you're going to find a better short-and-sweet summary of the research on writing instruction than Ed Research For Action's EVIDENCE-BASED PRACTICES FOR TEACHING WRITING IN MIDDLE AND HIGH SCHOOL. In two-and-a-half pages, it reviews, with ...
Actually, the headline on this post is not entirely accurate – the meta-analysis found that no matter what new language you’re teaching or learning, whether it was English or another language, a monolingual approach is not the best instructional strategy.
I just used that headline since many of this blog’s readers are ELL teachers.