The purpose of this paper is to verify the construct validity of the reading section of the Dialogic Language Assessment (DLA Reading) by assessing the difficulty of the DLA Reading and alternative texts, and to investigate the feasibility of using available grade-level supplementary Japanese language textbooks as alternative texts.
In the initial phase, a readability analysis was conducted on 19 texts. Subsequently, 213 native Japanese-speaking children participated in the study, providing reading comprehension and fluency scores for grade-level texts. The order of text difficulty was examined by analyzing the rating scores in the vertical scaling.
Results showed that three texts had low values in terms of text factors, but reasonable values were obtained for the remaining 16 texts after excluding the influence of some specific character types. Individual factor analysis confirmed that the other 16 texts were at an appropriate grade level. While two texts deviated from the expected order and displayed lower values, overall, the hypothesis was supported. Furthermore, it was observed that fluency in oral reading in lower grades influenced the difficulty criteria.
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