ABSTRACT
Asindividualsmakethetransitionfromchildhood toadolescence,theirbehaviorandattitudesareincreasinglyshapedbypeergroups.Informalintimatefriendshipgroupsaswellasmoreformallyorganizedgroups,
5suchasthoseassociatedwithschool-supportedextracurricularactivities,haveanimpactonadolescents' conductandbeliefs.Single-sexsocialorganizations, suchasfraternitiesandsororities,mayalsoaffectlate adolescents'attitudesandactions.
