Rapid digital transformation has encouraged local governments to adopt e-government systems to improve efficiency, transparency, and accountability. However, many digital public service applications still face a design–reality gap that affects user acceptance and long-term adoption. This study analyzes the acceptance of the SIMANTAP (Integrated Apparatus Management Information System) application implemented by the Civil Service, Education, and Training Agency (BKPP) of Bojonegoro Regency, East Java. The research integrates the Technology Acceptance Model 3 (TAM 3), Innovation Diffusion Theory (IDT), and Digital Era Governance (DEG) to provide a comprehensive understanding of factors influencing civil servants’ behavioral intentions. Using a quantitative approach, data were collected from 324 civil servants who had used SIMANTAP for at least three months and analyzed using Partial Least Squares–Structural Equation Modeling (PLS-SEM). The results indicate that perceived usefulness significantly influences behavioral intention, while perceived ease of use significantly affects perceived usefulness but not behavioral intention, reflecting the mandatory nature of system use. The findings also reveal several design–reality gaps related to system complexity, digital literacy, data integration, and organizational culture. This study contributes to e-government literature by offering an integrative analytical framework and provides practical recommendations for improving digital personnel management systems in the public sector.
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