Schools, peers, and media can all impact a child's development in various ways. In schools, teachers play an important role in encouraging academic success and involvement, though larger school sizes can increase anonymity among students. Peers are important for socialization and modeling behaviors. While media like television can influence children both positively and negatively depending on content, the medium itself is neutral - it is the messages within that matter most. The document discusses how schools, peers, and media each shape child development based on social-emotional theories.