Meifiana Eka Yulianto Putri, Nuzul Ahadiyanto

Public dissatisfaction with government services in Indonesia highlights the need to strengthen civil servants’ interpersonal communication competencies. Drawing on Eysenck’s personality theory, this study investigated the relationship between extraversion and assertive behavior among millennial Civil Service Police Unit (Satpol-PP) officers in Probolinggo City. Employing a quantitative correlational design, all 184 officers born between 1981 and 1996 (Mage = 38.4 years; 73.9% male, 26.1% female) participated through total population sampling. Extraversion was measured using the Eysenck Personality Questionnaire Revised Short Form (EPQR-S), while assertive behavior was assessed with the Assertiveness Inventory by Alberti and Emmons. Pearson’s Product-Moment correlation analysis revealed a significant positive relationship between extraversion and assertive behavior, r(182) = .389, p < .001, 95% CI [.26, .51]. This indicates that officers with higher levels of extraversion tend to exhibit more assertive behavior. However, the effect size was small to moderate, suggesting that extraversion explains only a limited portion of the variance in assertive behavior. The findings emphasize that while personality traits contribute to assertiveness, other psychological, situational, or organizational factors may play a more substantial role in shaping interpersonal effectiveness among civil servants.