We extend the routine activity perspective's situational analysis of c
rime to individual offending and to a broad range of deviant behaviors
. In this view, unstructured socializing with peers in the absence of
authority figures presents opportunities for deviance: In the presence
of peers, deviant acts will be easier and more rewarding; the absence
of authority figures reduces the potential for social control respons
es to deviance; and the lack of structure leaves rime available for de
viant behavior. To determine whether individuals who spend more time i
n unstructured socializing activities engage in deviant behaviors more
frequently, we analyzed within-individual changes in routine activiti
es and deviance across five waves of data for a national sample of mor
e than 1,700 18- to 26-year-olds. Participation in these routine activ
ities was strongly associated with criminal behavior, heavy alcohol us
e, use of marijuana and other illicit drugs, and dangerous driving. Fu
rthermore, routine activities accounted for a substantial portion of t
he association between these deviant behaviors and age, sex, and socio
economic status.