He conducted a study comparing successful and non-successful foreign language college students. He measured their intelligence, foreign language aptitude, and native and oral written language. No significant differences were seen in the intelligence and reading comprehension but significant differences where found in the Morden Language Aptitude Test. The conclusion of the study was that students with a foreign language disability may have underlying native language problems, especially in the syntax and phonology. They are working towards being able to diagnose someone with Foreign Language Learning Disabilities.