<![CDATA[This study aims to adapt a self-efficacy instrument for detention officers at Class IIA Magelang Correctional Facility and evaluate its measurement quality. The study employed a quantitative approach, with data collected through questionnaires administered to 55 respondents. The data were analyzed using IBM SPSS Statistics 25 through item-total correlation analysis and reliability testing using Cronbach’s Alpha. The preliminary analysis of eight items showed Corrected Item-Total Correlation values ranging from 0.749 to 0.934. The Cronbach’s Alpha coefficient was estimated at 0.964 based on the available statistics, indicating very high internal consistency. However, these findings alone are insufficient to establish the overall validity of the instrument. Content validity assessment through expert judgment, along with an evaluation of construct relevance and the adaptation procedures, is necessary to obtain more comprehensive evidence. This study is expected to produce a self-efficacy instrument that is appropriate for the work context of detention officers and can serve as an adequate measurement tool for future research.]]>
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