 Pimsleur found that among students with similar overall GPAs, those with lower scores in these two tests received lower grades in foreign languages.From this finding, Pimsleur concluded that the auditory component of language aptitude is the main factor that accounts for differences in language learning ability that are not explained by general intelligence, interest in learning a foreign language or general study habits.The PLAB can be used to identify students with a language learning disability when used in conjunction with other forms of evidence.