The impact of individualized vocabulary learning using an online spaced-repetition software application on the receptive lexical knowledge and agency of CEFR A2-level Japanese university students (N = 17) was investigated in this repeated-measures pilot study. The participants used the application to study vocabulary from one of five bands of the New General Service List (NGSL) based on their performance on the NGSL Test. A mixed-effects model indicated that learning vocabulary on the app predicted an increase on a delayed posttest at the end of the academic year—a large effect size. However, the effect of spaced review was not confirmed. All participants believed the app improved their English ability and the majority planned to continue using it independently in the future. The results suggest individualized online vocabulary study can contribute to vocabulary acquisition and promote learner agency. この反復測定パイロット研究では、CEFRのA2レベルの日本人大学生(N=17)の受容的な語彙知識と学習者主体に関して、オンラインの間隔反復ソフトウェアアプリを使用した個別の語彙学習の影響を調査した。参加者は、New General Service List(NGSL)テストのスコアによって、NGSLの5つのバンドの1つを選び、アプリを使用して、語彙を学習した。混合効果モデルでは、アプリで語彙を学習すると学期末の遅延ポストテストで成績向上(効果量大)が予測されることが示された。但し、間隔反復学習の効果は確証されなかった。すべての参加者は、アプリが英語能力を向上させ、大半が将来にアプリを単独で使用し続けるつもりだと考えた。その結果は、個別のオンライン語彙学習が語彙の習得に貢献し、学習者主体を促進できることを示唆している。
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