<![CDATA[The high level of interest from researchers in the study of psychological well-being necessitates the development of psychological well-being measurement tools in various contexts and cultures, particularly among high school adolescents in Indonesia. This study aims to modify the Indonesian version of the adolescent psychological well-being scale so that it can be used in the context of high school student respondents in Indonesia. The researchers also want to confirm whether the measurement model fits the four-dimensional theory in the context of high school students. This quantitative study involved 420 high school students across all grade levels, residing in South Jakarta, both male and female, and aged around 14-19 years. This study examines three studies: content validity testing by expert judgment using the Gregory format, construct validity testing using the second-order Confirmatory Factor Analysis (CFA) technique, and composite reliability testing using the stratified alpha formula. After going through the modification and adjustment stages, the developed measurement tool can obtain fit and reliable results on 18 items with four dimensions. This can be proven by obtaining a model that meets the fit parameter criteria (CFI = 0.952; TLI = 0.943; SRMR = 0.0516; RMSEA = 0.0451; χ²/df index = 1.8), high Gregory content validity coefficient, and a composite reliability coefficient value of 0.844.]]>
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