 The Pimsleur Language Aptitude Battery (PLAB) measures language learning aptitude.Language learning aptitude does not refer to whether or not an individual can or cannot learn a foreign language (it is assumed that virtually everyone can learn a foreign language given an unlimited amount of time).According to John Carroll and Stanley Sapon, the authors of the Modern Language Aptitude Test (a similar language aptitude test intended for older learners), language learning aptitude does refer to the "prediction of how well, relative to other individuals, an individual can learn a foreign language in a given amount of time and under given conditions".