Two studies came out recently which used a randomized design to show how interventions can be delivered in the classroom.  They both focused on making sure they were implemented properly and that teachers received the support they needed to help kids in the classroom.  It isn’t just about writing a manual, it’s about making sure teachers know how to deliver it.

https://www.ncbi.nlm.nih.gov/pubmed/29998740

https://www.ncbi.nlm.nih.gov/pubmed/29939056