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Callous-unemotional (CU) traits have been shown to be a temperamental risk factor identifying a subgroup of antisocial children with more severe and persistent antisocial behaviour. While existing research has demonstrated that antisocial children with CU traits show particularly severe impairment across multiple domains, much of this research has focused on the family context. Therefore, the current thesis aimed to explore CU traits in the school context. The four empirical studies included in this thesis use longitudinal data collected in South Korean primary schools (N = 218, aged 10–12 years; 52% boys) to examine questions regarding: 1) the validity of the CU traits measure in South Korean children; 2) unique associations of CU traits in predicting the trajectories of school-related outcomes; 3) the moderating effect of CU traits on teacher classroom strategies; and 4) associations between CU traits and social affiliation in school. The results of a confirmatory factor analysis supported the validity of the revised CU traits scale in the current sample. Furthermore, the results of latent growth curve modelling showed that CU traits are a unique predictor of a stable pattern of school disengagement across the school year. There was a significant interaction effect between CU traits and teacher strategies in predicting child engagement, such that harsh discipline predicted lower engagement only among children with low CU traits. A cross-lagged model analysis showed significant longitudinal associations between CU traits and social affiliation, such that CU traits predicted decreased teacher affiliation, and in turn, increased CU traits. The current thesis …