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The Analysis of High School Language and Expression Textbooks through Many-Facet Rasch Measurement Model
The aim of this study is to analyze High School Language and Expression textbooks through the use of the many-facet Rasch measurement model. A survey method was applied in the research. The research working group comprised teachers who taught Language and Expression lessons to grades 9th, 10th, 11th and 12th, and worked in Anatolian high schools in Elazığ/Turkey during the 2013–2014 academic year. The study focuses on measuring the four Language and Expression textbooks in terms of 13 criteria by 20 judges. A “Textbook Evaluation Form” including 13 criteria was created after a review of the literature and based on the views of experts. The validity index of the items specified as criteria in terms of Content Validity Ratios was found to be as 0.89. 9th grade Language and Expression textbook was inefficient according to the data calibration map. Moreover, among the criteria, the most difficult item realized was “Item10” and the most severe judge was recorded as being J12. From the study results, it is clear that the values involved in creating the separation index and the reliability co-efficient demonstrated a high degree of consistency among the items in the analysis of item difficulty.

Language and Expression Textbooks, Rasch Model, Teachers’ Views

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