The effects of grammatical knowledge and lexical knowledge on reading test in Korean language acquisition by Japanese learners.

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There was no effective test measuring the lexical knowledge of the Korean language. Therefore, the present study intended to develop the test of lexical knowledge for Korean as second language learners(KSL). The total of 96 lexical questions was administered to 61 KSL learners. Using the item response theory(IRT),a half of 48 items were selected as the final question items. Cronbach's alpha reliability coefficient yielded a very high at 0.98, showing exceptionally high reliability of the test. Furthermore, as the result of exploring the scores by structural equation modeling(SEM), the lexical knowledge have strong relation to the reading. The final version of lexical knowledge test is published for free and open use.