 Pimsleur included grade point average as an indication of general academic achievement as well as motivation in his factors.In addition, the verbal ability factor indicated how well a student would be able to handle the mechanics of learning a foreign language and the auditory factor indicated how well a student would be able to listen to and produce phrases in a foreign language.To test these four factors, Pimsleur developed the Pimsleur Language Aptitude Battery, which is available through the Language Learning and Testing Foundation.