This paper presents the results of a study of the relationships betwee
n the personality types of a group of English as a foreign language (E
FL) students in Indonesia and various measures of their academic perfo
rmance in a semester-long course including a series of EFL language me
asures. Students were the entering class of English majors (N=76) at a
university in Indonesia in the fall of 1991. We tracked them through
their performance in an Integrated Course, a 9-hour-per-week intensive
basic course they needed to pass in order to move on to any second se
mester or higher course. The course is team-taught in 3 sections of st
udents, with 3 teachers teaching each section. We gave the students th
e Myers-Briggs Type Indicator (MBTI), which had been translated into I
ndonesian. We report and discuss the validity and reliability of using
this as a measure of students' personality types. In addition, we tes
ted the students monthly on reading comprehension, vocabulary, grammar
and writing. Results show that these EFL students are almost evenly d
ivided between Extraverts and Introverts, with over 50% of the student
s being 1 of 2 (out of 16 possible) types: ESTJ (37%), ISTJ (21%). The
distribution of types for these EFL students is similar to those of E
SL students in similar studies. Although extraversion and introversion
are related to vocabulary and composite course scores, there are few
other direct relationships between learners' personality types and the
ir language performance. We discuss implications for further research,
as well as for EFL/ESL classrooms.