The digital transformation of school libraries has become an essential strategy for improving educational quality and strengthening students' information literacy. This study examines the acceptance and optimization of three library automation applications—SchiLS, SLiMS, and INLISLite—in senior high schools and Islamic senior high schools (SMA/MA) in Banda Aceh and Aceh Besar using the Technology Acceptance Model (TAM). A mixed-methods approach was employed by integrating quantitative and qualitative data collected through observations, questionnaires, and interviews involving 46 librarians selected using proportionate stratified random sampling. Quantitative data were analyzed using SPSS and evaluated based on information system effectiveness indicators, while qualitative data were analyzed descriptively. The findings reveal that the three library applications significantly enhance librarians' performance in managing library services, improving system usability, information quality, and operational efficiency. SchiLS demonstrated the highest level of user acceptance across most evaluation indicators, while SLiMS and INLISLite also showed positive contributions to library management. Despite these benefits, several challenges remain, including the limited availability of qualified library personnel, insufficient professional development opportunities, inadequate institutional support, and limited digital infrastructure, particularly internet connectivity. The study concludes that successful implementation of library automation systems depends not only on technological quality but also on organizational commitment, competent human resources, and sustainable policy support. Strengthening these factors is essential for maximizing digital library services and enhancing educational outcomes in secondary schools.
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