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 Response to Intervention in Middle School: Longitudinal Results From a Tiered-Reading Intervention With Struggling Adolescent Readers The Impact of Instructional Variables on Outcomes in Tier 2 First Grade Reading Intervention Intensity of Intervention to Achieve Student Growth: Perspectives From the NICHD LRDC Research Projects