This study intends to investigate the relationship between extraversion/introversion personality traits of Iranian EFL learners and their performance on Multiple Choice and Cloze tests. To achieve the aim of the study, 60 freshman English students of Arak and Kurdistan Universities who were at the intermediate level of proficiency, based on the QPT (Quick Placement Test, version 1) results, were given the Persian restandardized version of the adult EPQ (Eysenck personality questionnaire, 1975) to determine their personality trait of extraversion/introversion. Accordingly, 40 homogenous male and female students were selected and assigned to two equal groups of extraverts (20) and introverts (20). Then, the Michigan proficiency test (1982) was used to measure the participants' performance on Multiple Choice tests and two cloze passages, each with 20 blanks, were adopted to measure the participants' performance on cloze tests.Having determined the participants personality trait and their scores on MC and Cloze tests, a between group comparison was done on extraverts' scores on MC and introverts scores on MC tests. Likewise, the extraverts' scores on cloze test were compared to introverts scores on cloze tests. The results of independent sample t-test revealed that there is no significant difference between the performance of the introverts and extraverts on multiple choice and cloze tests. Implications for language pedagogy and suggestions for further research are discussed.
