This study investigated whether the framework of writing for English learners should be guided by the well-established reading-writing relation or by the receptive and productive nature of literacy skills. The writings of 209 advanced English learners in Korea were analyzed in relation to receptive and productive vocabulary knowledge and reading comprehension while controlling for writing fluency. Two sets of structural equation models were fitted: (1) productive skills (productive vocabulary and writing fluency) mediating receptive skills (receptive vocabulary and reading) and (2) reading mediating receptive and productive vocabulary knowledge. The results supported the second model in which reading completely mediated the contribution of receptive and productive vocabulary to writing. Although there were no direct effects of receptive and productive vocabulary knowledge, both had significant indirect effects on writing through reading and writing fluency. These results show that reading has a strong direct effect on writing above and beyond vocabulary, and that vocabulary knowledge contributes to writing development through reading.

This study examined the relationship between reading and vocabulary within general and academic context. Forty-seven Korean EFL university students who participated in this research were given a reading comprehension test of general and academic topics. Also, vocabulary tests were conducted to measure the students’ size of vocabulary and their knowledge of general and academic words. The results revealed different findings for each type of vocabulary and reading. First, learners’ size of vocabulary significantly predicted reading comprehension, but the predictive power of academic vocabulary was stronger than vocabulary size. Second, general reading comprehension showed a similar result with the overall reading comprehension score in that academic vocabulary made a stronger contribution than vocabulary size. Finally, a different result was found for academic reading comprehension, and students’ size of vocabulary rather than academic vocabulary was the only significant predictor. The results indicate the different characteristics of general and academic reading, which implicates that each type of reading should be taught in a different manner.

The current study investigated the usage of the bilingual Vocabulary Size Test (VST) within Korean EFL environment. Thirty-two university students with an intermediate to high proficiency participated in this study. The students were given a Korean bilingual version of VST and reported their official English scores. The findings of this study are as following: (1) The VST scores showed a significant relationship with students’ proficiency scores which indicates that students with a bigger size of vocabulary had a higher proficiency of English. (2) When VST scores were divided into each frequency level, no particular frequency band demonstrated a significant relationship with English proficiency. Also, the difficulty of each level did not show a consistent pattern. Based on the results of VST, the influence of Korean EFL environment such as loanwords and the test-oriented education system was discovered. This study provides implications for teaching vocabulary in EFL environment and suggests the need for developing of a vocabulary size test for Korean context.