https://www.edutopia.org/article/why-positive-call-home-worth-effort
“… research shows that when teachers raise the ratio of praise to reprimands, it can dramatically improve on-task behavior and decrease disruptions in the classroom. And in a 2012 study, Harvard education researchers Matthew Kraft and Shaun Dougherty found that “frequent teacher-family communication” improved the odds that students would complete their homework by 40 percent, and decreased the need for teachers to redirect kids’ attention to tasks by 25 percent. Class participation rates, they noted, increased by 15 percent.”