Articles: The Multiple Contexts of Youth Development: Implications for Theory, Research, and Practice; Observed Ecological Assets in Families, Schools, and Neighborhoods: Conceptualization, Measurement, and Relations With Positive and Negative Developmental Outcomes; A Longitudinal Examination of Family, Friend, and Media Influences on Competent Versus Problem Behaviors Among Urban Minority Youth; Youths' Caretaking of Their Adolescent Sisters' Children: Its Costs and Benefits for Youths' Development; The People They Know: Links Between Interpersonal Contexts and Adolescent Risky and Health-Promoting Behaviour; Understanding the Multiple Contexts of Adolescent Risky Behavior and Positive Development: Advances and Future Directions.