1. Effects of a Multitier Support System on Calculation, Word Problem, and Prealgebraic Performance Among At-Risk Learners. (July 2015) Authors: Powell, Sarah R.; Fuchs, Lynn S.; Cirino, Paul T.; Fuchs, Douglas; Compton, Donald L.; Changas, Paul C. Journal: Exceptional children Issue: Volume 81:Number 4(2015:Jul.) Page Start: 443 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗