This study aims to analyze the influence of Self-efficacy and Work engagement on employee Work Effectiveness at PT. Tasya Gasindo. It employs an associative quantitative approach with a sample of 35 employees selected via the saturated sampling technique. Data were collected through questionnaires and documentation, then analyzed using multiple linear regression with the aid of SPSS software. The results indicate that Self-efficacy, on its own, does not have a significant effect on employee Work Effectiveness. Conversely, Work engagement has a positive and significant effect on employee Work Effectiveness. Simultaneously, Self-efficacy and Work engagement significantly influence employee Work Effectiveness at PT. Tasya Gasindo. The coefficient of determination reveals that the two independent variables explain 58.7% of the variation in Work Effectiveness, while the remainder is influenced by factors outside the research model. These findings suggest that enhancing employee Work Effectiveness is driven more by high Work engagement than by self-belief alone.
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