Research is a priority at The Hill Center in order to validate our results and to contribute to the body of research about learning differences and instructional methodologies. A multi-sensory structured language methodology is at the heart of The Hill Center’s programs. Developed and refined over 30 years, the methodology is a research-based instructional approach with proven success. Thirty years of test data and three university research studies document the academic progress of students in the Hill program. An independent analysis of ten years of student achievement data is available and provides conclusive evidence of the success of The Hill Center methodology.