What Research Tells Us About Teaching Grammar
The authors offer research studies and other documented evidence that teaching grammar without a meaningful context does not improve student writing, largely because that approach does not address the root causes of errors. Several resources that support this position and offer more productive strategies are summarized, including the authors’ forthcoming book.
Smith, Michael W. and Wilhelm, Jeff. (2006). "What Research Tells Us About Teaching Grammar". Voices from the Middle, 13(4), 40-43.