This book describes the nature and significance of behavioural and emotional problems in adolescents, the role of early intervention and self-directed parenting programs in the prevention of the development of problems. In particular, this book sought to: a) determine the impact of a self-directed behavioural family intervention program on parents' perceptions of their adolescen's behaviour; b) assess the efficacy and consumer acceptance of a self-directed parenting intervention; and c) identify clinical implications arising from this research to assist practitioners in the appropriate use of self-directed behavioural family intervention programs.Teen Triple P is a behavioural family intervention for parents of adolescents. This research investigated whether a self-directed program, Self-directed Teen Triple P, which consists of a parent workbook and video is sufficient to reduce risk factors known to be associated with the development of serious emotional and behavioural problems in adolescents and enhance protective factors.