YesまたはNoの二値判断で簡易的に学習者の語彙力を測定することができるLexTALEという語彙サイズテストが，語彙知識と熟達度の指標として機能しうるかを検証することを目的に日本の大学生を対象にして行った研究です。英語を専攻している日本人大学生111名を対象に，LexTALE，英日翻訳テスト，Vocabulary Size Test (VST)を実施し，さらに英語力の自己評価も行ってもらいました。分析の結果，LexTALEスコアは，自己評価よりも翻訳スコアおよびVSTスコアとの相関が高いことがわかりました。また，LexTALEスコアは，TOEFL ITP®スコアとの相関性が高いことが分かりましたが，自己評価の方が高い相関性を示すものもありました。よって，簡易な診断テスト目的や，学習の一環としての利用であれば，LexTALEが英単語知識の近似的な尺度あるいは一般的な習熟度の尺度としても使用できる可能性があることがわかりました。
LexTALE
Examining the Validity of the LexTALE Test for Japanese College Students
The question of how vocabulary knowledge of second language (L2) learners can be measured in a valid and reliable way has attracted attention from researchers. One widely used format for assessing vocabulary knowledge is a Yes/No test, where learners are asked to indicate whether they know each vocabulary word on the test. The purpose of this study was to examine whether the LexTALE test, a recently developed Yes/No English vocabulary test, can be an approximate measure of vocabulary knowledge and general proficiency for Japanese learners of English. In this study, 111 Japanese university students majoring in English took the LexTALE, an English to Japanese translation test, and the Vocabulary Size Test (VST). They were further asked to provide self-ratings of their English proficiency. Analysis showed that the LexTALE score correlated more strongly with the translation score and VST score than self-ratings of their proficiency. The results also showed that the LexTALE score correlated significantly with the TOEFL ITP® score, although some self-ratings resulted in a higher correlation. The findings suggest that for Japanese learners of English, LexTALE may be used as an approximate measure of English vocabulary knowledge and, to a lesser extent, general proficiency.
Nakata, T., Tamura, Y., & Aubrey, S. (2020). Examining the validity of the LexTALE test for Japanese college students. The Journal of Asia TEFL, 17, 335–348. doi.org/10.18823/asiatefl.2020.17.2.2.335
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