As I was researching the Hattie's effect size for teacher clarity (.75 by the way) for another article that I was writing, I couldn't help but notice the top of the chart. There at the top of the bar graph that was being used to display the effect sizes in a comparative format was the longest bar with the effect size number of 1.57 [J. Hattie, visiblelearningplus.com, December 2017]! It just jumped out there as one of only seven effect sizes that exceeded 1.0 but easily outdistanced its closest competitor, self-reported grades, which stood at only 1.33. With an effect…

In today's world of education, we talk a lot about things like collaboration, collective teacher efficacy, student self-assessment, feedback and much more as a part of effective educational practice, but when you have been in education for many years, as I have, many "effective educational practices" have proven not to be as effective as we once thought. How do we know that what we are doing today is not just another "fad" that will go away only to be replaced by the next one? How can we be confident that the things we are doing today will last and that…