Elementary Teachers' Intervention Fidelity in Relation to Reading and Vocabulary Outcomes for Students at Risk for Reading-Related Disabilities.

Teachers' implementation of differentiated supplemental instruction is critical to help students with or at risk for reading-related disabilities acquire early reading and vocabulary skills. This study represents an initial investigation of whether classroom teachers' intervention fidelity (exposure, adherence, and quality) of targeted reading instruction (TRI, formerly called targeted reading intervention), a professional development program with embedded student intervention and weekly webcam literacy coaching support, was related to spring reading and oral vocabulary gains for students at risk for reading-related disabilities. The study also examined whether teachers' years of participation in TRI (1 year vs.