This volume contains a diverse set of chapters that offer a good balance of quantitative and qualitative methodologies; focus on children, youth, or both children and youth; and come from a variety of theoretical perspectives. Two prominent themes of the volume are adolescents' transition to adulthood and children's time-use issues. Several chapters address each of these issues, including one examining children's labor in Senegal. Two ethnographic studies are included: one analyzes student-teacher interaction in an urban high-school math class, while the other examines friendship development and maintenance of early elementary-aged African American girls. The volume also includes a policy analysis of medical insurance provision for low income children, and a response to an earlier chapter on children's rights that appeared in Volume 8.