According to our previous research no attempt was made to find a multiple regression model, and consequently a correlation between the personality trait of an introvert/extrovert, individual motivation and an approach to Russian language L2. After a general review of the literature, we mainly concerned English as a foreign language (ESL). A research was made through a survey of Italian students learning Russian L2 outside the language environment in Italy. Starting from their answers we made a suitable score system, thanks to which we made a distribution, graphical and descriptive function for all the three variables. Finally a multiple regression model is provided to make reconciliation among the variables with statistical estimators of reliability.