Adolescence is a period of enormous adjustment for both teenagers and families. As children transition from childhood to adulthood, they go through many physical, emotional and behavioural changes. Not surprisingly, many parents describe adolescence as the most difficult and anxiety-provoking period of their children’s life. Parents’ concerns are well justified, considering the high prevalence of emotional and behavioural problems during adolescence. Although health professionals and researchers share parents’ view of adolescence as a challenging period of life, the scope of research on adolescents is scarce compared to research on children and adults. However, this is now changing. Research on adolescent development and adolescent psychopathology has increased dramatically during the last two decades. Reducing risk factors in adolescents’ development has been receiving more and more attention both from researchers and policy makers. Family risk factors such as inadequate parental monitoring and family conflict are among potentially modifiable risk factors that can be targeted in order to reduce the rate of emotional and behavioural problems in adolescents. Behavioural family intervention is considered to be one of the promising intervention systems in this area because of the extensive empirical support it has received in research with families of preadolescence children. The research presented in this thesis focuses on parenting programs for parents of teenagers. The first study evaluates the efficacy of a behavioural family intervention (Triple P – Positive Parenting Program) targeting parents of teenagers. The second study explores factors which affect parents’ decisions to participate in parenting programs. The first study outlines a randomised control trial (RCT), assessing the efficacy of a parenting intervention in reducing behavioural problems in adolescents. The study provides support for an intensive individual version of Teen Triple P – a behavioural family intervention designed specifically for parents of high risk adolescents. The intervention aims to improve adolescent behaviour by reducing parents’ use of ineffective parenting. Participants were 46 families with a teenager aged 11 to 16. The outcomes of the intervention included a reduction in teen disruptive behaviours (d > .85) and parent-adolescent conflict (d = .1.21), as well as decreased parental use of harsh and coercive parenting strategies (d = 1.15) and a decrease in parents’ conflict over child rearing issues (d = .64). These positive changes were maintained at the three-month follow up. In spite of the growing recognition of parents’ need for information, guidance and support during the crucial and challenging years of adolescence, little is known about the factors which affect parents’ engagement in programs designed to help them in their parenting roles. The second study aimed to provide a conceptual framework for understanding parents’ decisions to accept or decline participation in a parenting program by employing the Health Belief Model (HBM). The model suggested that parents are more likely to participate in a program when they (a) perceive their adolescents to be susceptible to development of problem behaviours, (b) perceive the problem behaviours to have serious consequences, (c) believe the parenting program to be beneficial in reducing the risk of development of problem behaviours in their adolescent, (d) perceive the personal, social and financial cost of attending the program to be low, and (e) are confident in their ability to successfully learn and apply what they learn in these programs. The model explained 31% of the variance in parents’ inclination to participate in parenting programs. The study also showed that parents differ in their preferences of delivery format for parenting programs. These two studies contribute to the literature in a number of ways. Firstly, they demonstrate that parent training is an effective intervention in the treatment of adolescent problem behaviours. Secondly, they highlight the importance of addressing parents’ beliefs and attitudes about the benefits of parenting programs as well as reducing participation barriers to encourage greater parental engagement in prevention and intervention programs. Finally, the research emphasises that in order to increase participation rate, parenting programs should be made available in a range of delivery formats. The implications of the current research and future directions are presented and discussed.

Adolescence is a period of enormous adjustment for both teenagers and families. As children transition from childhood to adulthood, they go through many physical, emotional and behavioural changes. Not surprisingly, many parents describe adolescence as the most difficult and anxiety-provoking period of their children’s life. Parents’ concerns are well justified, considering the high prevalence of emotional and behavioural problems during adolescence. Although health professionals and researchers share parents’ view of adolescence as a challenging period of life, the scope of research on adolescents is scarce compared to research on children and adults. However, this is now changing. Research on adolescent development and adolescent psychopathology has increased dramatically during the last two decades. Reducing risk factors in adolescents’ development has been receiving more and more attention both from researchers and policy makers. Family risk factors such as inadequate parental monitoring and family conflict are among potentially modifiable risk factors that can be targeted in order to reduce the rate of emotional and behavioural problems in adolescents. Behavioural family intervention is considered to be one of the promising intervention systems in this area because of the extensive empirical support it has received in research with families of preadolescence children. The research presented in this thesis focuses on parenting programs for parents of teenagers. The first study evaluates the efficacy of a behavioural family intervention (Triple P – Positive Parenting Program) targeting parents of teenagers. The second study explores factors which affect parents’ decisions to participate in parenting programs. The first study outlines a randomised control trial (RCT), assessing the efficacy of a parenting intervention in reducing behavioural problems in adolescents. The study provides support for an intensive individual version of Teen Triple P – a behavioural family intervention designed specifically for parents of high risk adolescents. The intervention aims to improve adolescent behaviour by reducing parents’ use of ineffective parenting. Participants were 46 families with a teenager aged 11 to 16. The outcomes of the intervention included a reduction in teen disruptive behaviours (d > .85) and parent-adolescent conflict (d = .1.21), as well as decreased parental use of harsh and coercive parenting strategies (d = 1.15) and a decrease in parents’ conflict over child rearing issues (d = .64). These positive changes were maintained at the three-month follow up. In spite of the growing recognition of parents’ need for information, guidance and support during the crucial and challenging years of adolescence, little is known about the factors which affect parents’ engagement in programs designed to help them in their parenting roles. The second study aimed to provide a conceptual framework for understanding parents’ decisions to accept or decline participation in a parenting program by employing the Health Belief Model (HBM). The model suggested that parents are more likely to participate in a program when they (a) perceive their adolescents to be susceptible to development of problem behaviours, (b) perceive the problem behaviours to have serious consequences, (c) believe the parenting program to be beneficial in reducing the risk of development of problem behaviours in their adolescent, (d) perceive the personal, social and financial cost of attending the program to be low, and (e) are confident in their ability to successfully learn and apply what they learn in these programs. The model explained 31% of the variance in parents’ inclination to participate in parenting programs. The study also showed that parents differ in their preferences of delivery format for parenting programs. These two studies contribute to the literature in a number of ways. Firstly, they demonstrate that parent training is an effective intervention in the treatment of adolescent problem behaviours. Secondly, they highlight the importance of addressing parents’ beliefs and attitudes about the benefits of parenting programs as well as reducing participation barriers to encourage greater parental engagement in prevention and intervention programs. Finally, the research emphasises that in order to increase participation rate, parenting programs should be made available in a range of delivery formats. The implications of the current research and future directions are presented and discussed.

Adolescence is a period of enormous adjustment for both teenagers and families. As children transition from childhood to adulthood, they go through many physical, emotional and behavioural changes. Not surprisingly, many parents describe adolescence as the most difficult and anxiety-provoking period of their children’s life. Parents’ concerns are well justified, considering the high prevalence of emotional and behavioural problems during adolescence. Although health professionals and researchers share parents’ view of adolescence as a challenging period of life, the scope of research on adolescents is scarce compared to research on children and adults. However, this is now changing. Research on adolescent development and adolescent psychopathology has increased dramatically during the last two decades. Reducing risk factors in adolescents’ development has been receiving more and more attention both from researchers and policy makers. Family risk factors such as inadequate parental monitoring and family conflict are among potentially modifiable risk factors that can be targeted in order to reduce the rate of emotional and behavioural problems in adolescents. Behavioural family intervention is considered to be one of the promising intervention systems in this area because of the extensive empirical support it has received in research with families of preadolescence children. The research presented in this thesis focuses on parenting programs for parents of teenagers. The first study evaluates the efficacy of a behavioural family intervention (Triple P – Positive Parenting Program) targeting parents of teenagers. The second study explores factors which affect parents’ decisions to participate in parenting programs. The first study outlines a randomised control trial (RCT), assessing the efficacy of a parenting intervention in reducing behavioural problems in adolescents. The study provides support for an intensive individual version of Teen Triple P – a behavioural family intervention designed specifically for parents of high risk adolescents. The intervention aims to improve adolescent behaviour by reducing parents’ use of ineffective parenting. Participants were 46 families with a teenager aged 11 to 16. The outcomes of the intervention included a reduction in teen disruptive behaviours (d > .85) and parent-adolescent conflict (d = .1.21), as well as decreased parental use of harsh and coercive parenting strategies (d = 1.15) and a decrease in parents’ conflict over child rearing issues (d = .64). These positive changes were maintained at the three-month follow up. In spite of the growing recognition of parents’ need for information, guidance and support during the crucial and challenging years of adolescence, little is known about the factors which affect parents’ engagement in programs designed to help them in their parenting roles. The second study aimed to provide a conceptual framework for understanding parents’ decisions to accept or decline participation in a parenting program by employing the Health Belief Model (HBM). The model suggested that parents are more likely to participate in a program when they (a) perceive their adolescents to be susceptible to development of problem behaviours, (b) perceive the problem behaviours to have serious consequences, (c) believe the parenting program to be beneficial in reducing the risk of development of problem behaviours in their adolescent, (d) perceive the personal, social and financial cost of attending the program to be low, and (e) are confident in their ability to successfully learn and apply what they learn in these programs. The model explained 31% of the variance in parents’ inclination to participate in parenting programs. The study also showed that parents differ in their preferences of delivery format for parenting programs. These two studies contribute to the literature in a number of ways. Firstly, they demonstrate that parent training is an effective intervention in the treatment of adolescent problem behaviours. Secondly, they highlight the importance of addressing parents’ beliefs and attitudes about the benefits of parenting programs as well as reducing participation barriers to encourage greater parental engagement in prevention and intervention programs. Finally, the research emphasises that in order to increase participation rate, parenting programs should be made available in a range of delivery formats. The implications of the current research and future directions are presented and discussed.