Anonymised dataset

This dataset contains item-level responses to an adapted Japanese version of Oxford’s Strategy Inventory for Language Learning (SILL). As part of a two-stage adaptation and validation study, the same 50-item adapted instrument was administered in both Stage 1 (calibration) and Stage 2 (validation) to undergraduate students enrolled in English-as-a-foreign-language (EFL) courses at two private universities in Japan. Although the final validated scale reported elsewhere comprises 22 items, the present dataset preserves responses to all 50 adapted SILL items collected at both stages, thereby supporting transparency, secondary analyses, and potential revalidation or alternative model testing.本数据集包含针对牛津语言学习策略量表（Strategy Inventory for Language Learning，SILL）适配日语版的条目级作答数据。作为两阶段适配与效度验证研究的一部分，研究人员向日本两所私立大学修读英语作为外语（English-as-a-foreign-language，EFL）课程的本科生，分别在阶段1（校准阶段）与阶段2（验证阶段）施测了同一套包含50个条目的适配版量表。尽管已有研究报道的最终验证版量表仅包含22个条目，但本数据集完整保留了两个阶段收集到的全部50个适配版SILL条目作答数据，可为研究透明化、二次分析、潜在的重新效度验证或替代模型检验提供支撑。