Through this work we are focusing on discussing the relationship between the Traits of Personality and the performance of Students in EFL Learning (introversion/extroversion and other determining factors of the educational Process) within the Dominican's Society context as largely perceived by Teachers of English as a Foreign Language. There have been a great number of international studies already published which had tried to explain the effects of such features of the student's personality, mostly introversion/extroversion on the student's performance in foreign language learning, something, which from the teacher's perception have always been presumed as an unquestionable fact. Although the results of many of the studies have often been labeled as contradictory, some of them show, however a clear or positive correlation between language competency achievement and/or proficiency vs. Personality features, some others do not. Among the reasons for subtracting validity to the referred studies various relevant variables might be cited, such as the validity of the assessment of the tools administered, the internal/external factors that affect their academic environment, and furthermore; the socio-economic, cultural, and gender factors of our students within the Dominican society context.