A valid, reliable, and practical instrument is needed to evaluate ESL textbooks in Malaysian community colleges. Thus, a questionnaire guided by the Litz Theory (2005) was designed to evaluate ESL textbooks in Malaysian community colleges. This paper assessed the validation of the questionnaire using the Rasch Model analysis of construct validity and reliability. The questionnaire investigates community college students' perceptions of the ESL textbooks they use in their classrooms. The sample of this study comprised 123 community college students in Malaysia. The Rasch Model produced construct validity and reliability measurements using the dimensionality, item fit, and item polarity parameters and the person and item separation analysis. The results of the Rasch Model Analysis reveal that the construct validity in the study shows the uniformity of the instruments in the good category. This indicates that the items used in this study are related to the material's content. Hence, this questionnaire is valid and reliable to evaluate ESL textbooks in Malaysian community colleges. © 2024, Southeast Asian Association for Institutional Research. All rights reserved.
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