The ASEAN Journal of Education ASEAN Journal of Education

EFL Learners’ Vocabulary Size: A Case in the Northeastern Region of Thailand

Suthasinee Kotchana, Angkana Tongpoon-Patanasorn,


A large vocabulary size provides a foundation for language learners to achieve language skills and is substantially important for second/foreign language development. Previous studies on vocabulary size in Thailand mainly examined learners’ receptive vocabulary knowledge with a small sample size. This present study, therefore, aimed to examine primary school students’ receptive and productive vocabulary knowledge with a larger samples size adopting Nation’s vocabulary size receptive and productive tests (2008). The data were collected from 453 Grade 6 students (201 males and 252 females) enrolled in the second semester of the 2014 academic year. The data were analyzed using mean ( χ ) and standard deviation (S.D.); Nation’s formula for the calculation of vocabulary size was adopted. The findings of the study revealed that Grade 6 students had a vocabulary size of approximately 462 words, and their productive vocabulary size is approximately 292.05 words. It is notable that the size of the receptive vocabulary is almost two times greater than the productive vocabulary size. Important factors affecting vocabulary knowledge and guidance for English language development in Thailand will be discussed.

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Key words: English Language Teaching. , Receptive Vocabulary Knowledge, Productive Vocabulary Knowledge,
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