Text-based learning resources are critical for helping pupils learn mathematics. However, limited studies have been conducted on designing mathematics modules as text-based learning materials for Vocational High School (VHS) students. Hence, developing an integrated Realistic Mathematics Education (RME) and Project-based Inquiry (PIL) module could be an innovative solution. This study analyzes the validity assessment as a part of the developmental stage of developing the module. The validation process was conducted by a team of five experts in mathematics education, who used a questionnaire to assess the face and content validity. The questionnaire evaluated four key aspects of face validity: language, text, graphics, and presentation. In terms of content validity, it considered five crucial elements: suitability to the target population, implementation of each module activity based on the principles of RME and the phases of PIL, compatibility with the allocated time, ability to enhanc.....

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