Fantastic! Greeting from Italy!

Thank you, great explanation!

You can critique Hattie's work right from his initial claim 98% of things work, e.g his main Feedback study Kluger &DeNisi report more than 38% of feedback does not work! Marzano says about 40% of things don't work. Then there is the file drawer problem, which is a bias toward studies that work, ones that don't work are not published but put in a file drawer. There is a lot of peer review critique of Hattie's work, teacher's need to be aware of this, I've summarised here - visablelearning.blogspot.com/

That must be the voice of Tree Trunks from Adventure Time :O Very cool video!

Wow Nancy, you're great! Thank you so much for the clarification!

Ok . . . so I taught in public school for forty years and am developing a pity for Hattie having wasted his life on crunching numbers that basically add up to zero.

One of the best lectures on instructional design. Thank you

Your slide which mentions Effect Size the average should be 0.4 not 0.04 as listed.