Therefore, Learners depending on the type of their personality resort to different learning styles which affect their learning performance. Similarly, Erton (2010) established the relationship between personality (extroversion-introversion) and foreign language learning. Again, the research, in accordance with the previous studies, e.g. Blick (1996); Noftle and Robins (2007), maintained that the reflections of different personality types could be observed in students’ developing appropriate learning styles for themselves. Conclusively, the message of the above statements and studies is: style, among other things, can be seen as a conceptual bridge between cognition and personality which implies that styles can act as mediators and/or moderators on performance (Messick, 1994). In addition, personality traits/types as being expressed in styles (learning styles) can be viewed as non-cognitive psychological variables in learning performance. In fact, studies have implied that learning styles may have mediator/moderator effects between personality and learning achievements (Blickle, 1996; Diseth, 2003).Thus, in achieving the academic goals and learning performance, personality is a dominant factor on the base of which students’ learning styles shape and learning performance evolves. Moreover, personality variables, (affective learning styles) as moderators in the process of learning, i.e. second language learning have a direct or indirect influence on learners’ performance. 4. Personality and Reading Comprehension Reading comprehension is defined as the process of unlocking meaning from connected text. Up to now, reading comprehension as a great source of knowledge has been one of the important parts in second/foreign language tests and examinations; it plays a basic role in the educational and professional life of many students. The fact that each learner has his/her own performance in language skills induced Niaman (1978) and other researchers to focus on the concept “Good Language Learner” (GLL) to reveal learner characteristics contributing to successful language learning. Accordingly, and based on the fact that reading is integral to learning, it seems logical if someone thinks of the concepts “Good and Poor Readers” and the reasons why some readers outperform others as good readers? The literature shows that personality is related to learning styles and learning is often contingent upon reading skills. Consequently, it is reasonable if someone presumes a relationship between personality and reading comprehension (Gray, 1999). On the other hand, most learners contribute their failure in reading tests to the complexity of reading comprehension text, while, some reasons root in affective variables among which personality is of the great importance. The fact that there is a relation between personality and reading comprehension has been verified in a few researches.