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 25 years, the methodology is a research-based instructional approach with proven success. Twenty-five years of test data and three university research studies document the academic progress of students in the Hill program. A recent independent analysis of ten years of student achievement data is now available and provides conclusive evidence of the success of The Hill Center methodology.