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Hypernasality with/without articulation disorders are significant speech defects among patients with Cleft Lip and/or Palate (CLP), particularly in school-aged children. Thus, there has not been a systematic program to deal with hypernasality for Thais. Therefore, this study aimed to develop a hypernasality modification program for Thai school-aged children with CLP. The hypernasality modification program in Thai school-aged children was practically developed into a systematic manual based on previous literature reviews. The program consisted of multiple steps written from one word to narrative levels, according to Thai syllable structure instruction. After completing the 1st version of the development program, content validity was determined by a panel of five experts. The hypernasality modification program showed excellent validity index (S-CVI = 0.98) and item content validity index (I-CVI = 0.8 to 1.0). After the researchers’ panel review and discussion based on the experts’ suggestions, the 2nd version was delivered for the next step in the near future. The results indicated that the hypernasality modification program was valid and could be used for Thai school-aged children with CLP. Further research will be needed to determine the effectiveness of this program.
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