RTI Interventions

HI, I am doing a research for my Masters Thesis on Response to Interventions...I am looking to see if any of your schools do this in the classroom and if so you could pass along some data. I am looking for number of students involved with RTI, and after the 3-tier model, how many students go on to receive a referral for CSE?

If anyone has any insights on tracking the RTI I would love to find out! Thanks!