In a series of empirical studies, the KEeKS projekt aims to investigate the relationships between language development and emotional competences in children. Previous research support the assumption, that children with high levels of language competence are better able to regulate emotional expressions and impulsive behavior and seem to be less prone to behavioral problems. So far, research on the mechanisms behind these relationships is limited. It seems plausible that advanced language competences might facilitate children’s understanding of parents’ and teachers’ emotion coaching as well as children’s own cognitive representation of emotions and emotion regulation strategies. Moreover, children with well-developed language competences might have it easier to communicate their needs and feelings and thus might be able to solve problems more efficiently.