This manual provides information and guidance for people (mental health professionals, other health professionals, paraprofessionals, school personnel, nonprofessional community volunteers, and youth workers) concerned with the mental health needs of adolescents who experience sexual assault. The four chapters provide these people with assistance in: (1) understanding the nature of sexual assault among adolescents--its incidence, causes and consequences; (2) identifying adolescent victims of rape and sexual assault; (3) providing needed support for adolescent victims, with particular stress on the range of community referrals possible; and (4) prevention strategies for avoiding sexual assault among adolescents. Chapter 1, Extent of Sexual Assault among Adolescents, defines sexual victimization and the relationship between victims and offenders and examines incidence according to the typology of the perpetrator. Chapter 2, the Reaction of Adolescents to Sexual Assault, describes developmental tasks of adolescence in relation to the trauma of sexual assault, classifies response patterns to sexual assault, and explains family responses to adolescent victimization. Chapter 3, Meeting the Needs of Victims and Offenders, offers disclosure patterns in sexual assault and ways to identify suspected cases, examines victim needs and offender needs, and suggests community referral. Chapter 4, Prevention Strategies, suggests strategies for the community, the family, and the individual. A list of 68 references is included. (ABB)