The instruments utilized in this study included a language proficiency test, a pre-test, and a post-test. The language proficiency test was a valid and standardized general proficiency test called CELT. The test consisted of three sections: structure section including 75 items, vocabulary section including 75 items, and reading comprehension section containing 25 items. All the items were in multiple-choice format. The pre-test was a reading comprehension test the content of which was selected from passages included in the subjects' course of specialty. 30 multiple-choice questions were developed on the basis of references and conjunctions used in the text. In order to come up with a well-formed test, a pilot study was conducted with 30 students of computer sciences who did not take part in the main study and the items with facility indexes of above .63 and below .37 were discarded from the test. As a result, 20 well-formed items were included in the pre-test. The post test was a reading comprehension test of nearly the same readability level as that of the pre- test. The criteria for developing the post-test were the same as those of the pre-test.