The Weeds of the Research- I love it- but it may be too much at times.

Professor John Hattie focuses on actionable research for teachers. I find his research both fascinating and unsurprising. He works to understand what will make a successful classroom. He investigates classroom management, class size, latest and greatest programs. He studies classrooms around the world to exhaustion. 

Professor Hattie’s most recent list (2018) includes 252 factors related to student achievement and their relative impact. #1 and #3 make a collective powerhouse for your students. For reference, the average effect size is 0.4.

As you look at the table below, know that Hattie and his researchers consider anything above 0.4 to be positive impact, worth focussing on.

*Check out how much worse boredom is even than a poor night’s sleep!

	Factor Related to Student Achievement	Effect Size (252 influences to complete total effect size of 100)
1	Collective Teacher Efficacy	1.57
2	Self-Reported Grades	1.33
3	Teacher Estimates of Achievement	1.29
4	Cognitive Task Analysis	1.29
5	Response to Intervention	1.29
6	Piagetian Programs	1.28
7	Jigsaw Method	1.20
8	Conceptual Change Programs	0.99
9	Prior Ability	0.94
10	Strategy to Integrate with Prior Knowledge	0.93
11	Self-Efficacy	0.92
12	Teacher Credibility	0.90
13	Micro-Teaching/Video Review of Lessons	0.88
14	Transfer Strategies	0.86
15	Classroom Discussion	0.82

According to Professor Hattie, anything below a 0.4 effect size is likely not worth tending to. And a negative effect size IS worth tending to, in its correction. Some factors of note lower on the list:

	Factor Related to Student Achievement	Effect Size (252 influences to complete total effect size of 100)
	Practice Testing	0.46
	Matching Style of Learning	0.31
	Homework	0.29
	Audio-Visual Methods	0.22
	Co or Team Teaching	0.19
	Programmed Instruction	0.18
	Lack of Sleep	-0.05
	Student Feeling Disliked	-0.19
	Boredom	-0.49

Another great visual Hattie’s Research- broken into area focuses

A beautiful simple visual: Visible Learning Barometer of Influences

To be fair, criticism of Hattie’s work

And, year after year, the data returns that you, yes, YOU, the effective teacher, are the greatest asset, the greatest determinate of student success.

The Back-Up from Chetty, Freidman, Rockoff

A “high-value” teacher at any age can increase the lifetime earning potential of their students by $250,000, according to a study done in 2012 by Raj Chetty, John N. Friedman & Jonah E. Rockoff.

And

From RAND Corporation: Measuring Teacher Effectiveness

There are so many directions to go in the study of assuring your importance. That’s for later. Now- just take it in. 

You are it. You are where it all begins.