Description Council for Exceptional Children (April 2010) Jack Fletcher: Identifying Learning Disabilities in an RTI System Citation Fletcher, J. (2010). Identifying learning disabilities in an RTI system. More by These Authors The Impact of Instructional Variables on Outcomes in Tier 2 First Grade Reading Intervention Effects of Intensive Reading Intervention for Eighth Grade Students With Persistently Inadequate Response to Intervention Intensity of Intervention to Achieve Student Growth: Perspectives From the NICHD LRDC Research Projects