Children's peer relations represent a key aspect of school adjustment. However, little is known about their social-cognitive precursors. To address this gap, the authors followed 70 children across the transition to primary school. At Time 1 (age 5), Time 2 (age 6), and Time 3 (age 7), children were assessed on their theory of mind, prosocial behavior, and verbal ability. In addition, at Time 2 and at Time 3, the authors gathered peer nominations. Results supported the authors' mediational hypothesis of indirect paths from early theory of mind to subsequently lower peer rejection and higher peer acceptance, via improvements in prosocial behavior. The authors discuss implications of these longitudinal effects for the understanding of the impact of social-cognitive achievements for children's developing social relations.

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The relation between children's mental state knowledge and metaknowledge about reading was examined in 2 studies. In Study 1, 196 children (mean age = 9 years) were tested for verbal ability (VA), metaknowledge about reading, and mental state words in a story task. In Study 2, the results of Study 1 were extended by using a cross-lagged design and by investigating older children (N = 71, mean ages = 10 years at Time 1 and 11 years at Time 2) for mental state knowledge, metaknowledge about reading, and VA. Results showed a significant relation between early cognitive (but not emotion) mental state knowledge and later metaknowledge about reading, controlling for VA. Results suggest close links between different aspects of children's knowledge about the mind.