Book excerpt: Sibling Interaction Across Cultures is a collection of studies focusing on the role siblings play in the social, emotional, and cognitive development of their younger siblings. Unlike much previous research on sibling relationships, these studies share the underlying assumption that social interaction plays a significant role in the acquisition and transmission of cultural knowledge and social understanding. The contributors evaluate the advantages as well as limitations of current methodological issues directly affecting sibling research and assess the various theoretical perspectives underpinning these methodologies. Drawing from empirical, cross- and infra-cultural research, this volume lays new groundwork for identifying universal, environmental, and culture-specific aspects of the role of siblings in child development.