In examining your research on teacher-student relationships, in 2009 and 2011, the effect size of teacher-student relationships was 0.72. In 2015, the effect size dropped to 0.52. To what do you attribute the drop in effect size?

This is because I keep adding new meta-analyses as they come in. The story, however is in the details here – it is still critically important as without these relationships and trust it is unlikely that students would ever admit to errors and not knowing, be receptive to feedback to improve – the core of learning” (John Hattie, personal communication, February 23, 2018).