In recent developmental theorizing, it has been hypothesized that teacher-child conflict and children's externalizing behavior affect one another reciprocally over time. However, the relation between teacher-child conflict and externalizing behavior has been mainly studied from a unidirectional point of view. Therefore, this study aimed to test the hypothesis of bidirectionality by means of a cross-lagged longitudinal design with kindergarten teacher reports on core variables at 3 measurement occasions in 1 year. Structural equation modeling with data of 148 kindergartners provided evidence for the hypothesis of bidirectionality. Specifically, results supported a transactional sequence in which children's aggressive behavior at the beginning of kindergarten led to increases in teacher-child conflict midyear, which in turn led to an increase of aggressive behavior at the end of the kindergarten school year.
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