The 1990s saw considerable advances in the state of research on adolescence
and youth. This article provides a critical commentary on a subset of this
research, focusing on the causes and consequences of the lengthened period
in which the transition to adulthood occurs. It provides a brief history o
f adolescence research, identifying a select set of topics, themes, and res
earch problems that will guide research on adolescence and youth over the n
ext decade. These research foci, which include peer group relations, biolog
ical influences on adolescence, employment experiences, increased autonomy,
and racial and gender differences, are described as representing either co
ntinuities or advances in adolescence research. The strengths and shortcomi
ngs of this research are detailed. The paper concludes by suggesting promis
ing areas for future research and by providing guidelines for undertaking s
uch research.