John Hattie The Power of Feedback 

The part about feedback starts at 14:38 General information about Visible Learning from about 5:40 Four levels of feedback 18:12 Feedback at the self level 20:37 Method in the project and examples 22:19 Q&A 25:20 Teachers provide much feedback, students receive little 30:28 Building a feedback culture 33:00 ... The Learning Pit, Feedback feeds on errors 48:51

There has been a lot of peer review critique showing only 1 out of the 23 studies cited in Hattie's Visible Learning (VL) has anything to do with feedback for students in the classroom. Hattie & his co-authors in The Power of Feedback Revisited (2020)- finally agreed, while not directly acknowledging the wide variety of issues in VL, Hattie and his co-authors completely excluded 8 of the original 23 meta-analyses and partially excluded a further 11 meta-analyses, resulting in a substantially reduced ES of 0.48. It is hard to see how Hattie creates a story of feedback relevant to the class room from these meta-analyses - details here - visablelearning.blogspot.com/p/feedback-revisited.html