The intent of this paper is to suggest the dimensions of intentional learning and identify the key cognitive benefits of systems modeling with regard to intentional learning through a review of related studies. The authors propose that intentional learning occurs when learners realize the need for refining their conceptual understanding, relate…

Language competence in various communicative activities in L2 largely depends on the learners' size of vocabulary. The target vocabulary of adult L2 learners should be between 2,000 high frequency words (a critical threshold) and 10,000 word families (for comprehension of university texts). For a TOEIC test, the threshold is estimated to be…