There is a lot of information about teaching and classroom management and student achievement. John Hattie is a leader in the field with a tremendous amount of meta data on empirical research. I am not a student of his work. I do not think I knew his name until this past week when someone posted on twitter about his research. I have only begun to scratch the surface of his work.The Glossary of affected areas seems to be a high spot and starting point for research. (http://visible-learning.org/hattie-ranking-influences-effect-sizes-learning-achievement/) I wish it had a link or a pop up for definitions on each of the areas. Some seem fuzzy for me and it may be the difference in Northern vs. Southern Hemispheres.
I did find this article with some definitions of the categories (http://www.teacherstoolbox.co.uk/T_effect_sizes.html)
I do hope I can delve in more over the next little while to get a better understanding of the data.