the teachers learn about the harrison ford of the education world, researcher john hadi.>> 300 educators, 35 districts and one goal. find out what works for students and what doesn't. >> you ask what works. it is probably 97% of things. by asking the question, we are spent trillions we should ask what works best.>> he argues -- >> reporter: he argues that too much time is spent on curriculum, assessments and achievement. these issues are virtually meaningless. >> it's not about the grade, it's about what you learned and what you are going to do with the learning.>> reporter: hattie has studied millions of students over 4 decades. for what teachers can use.>> reporter: he says that we must better communicate. >> some of the best teachers want to be left alone and we can't afford to do that. other professions work on how to communicate and work together better. we demand that are kids be socially able and learn to interpret. why can we do that with teachers? >> ror more education for two -- for educators so that the students get the best education possible. >>> voters in the second congres