This thesis investigated the views, opinions and experiences of children, young people and parents of mental health services and Triple P parent training using qualitative methods. It is divided into four separate papers, the first three written as standalone journal papers. Paper 1 is a systematic review and synthesis of qualitative studies exploring children's views and opinions of mental health services. The review used specific databases, a search of qualitative journals and a general Internet search to identify relevant studies. The paper utilized inclusion/exclusion criteria and a quality appraisal assessment. Fifteen studies meeting inclusion and quality criteria were identified exploring the experiences of 378 children and young people aged between 5 and 16 years, from a range of countries. The review then involved synthesising the findings of these studies to generate several overarching themes. Themes that emerged were; the stigma of mental health difficulties; alliance making and breaking properties; the physical location of services; consent and confidentiality; preferences for creative therapies and a recognition of therapeutic stages. Paper 2 is an original research study that explored the experiences of parents of Triple P parent training. Eight parents were interviewed using a semi-structured protocol. Data were analysed using Interpretative Phenomenological Analysis. Emergent themes were; a search for a cause; the stigma of parenting difficulties; the destruction and recreation of family life and a shift in perspective. Paper 3 explores the views and opinions of children whose parents have recently undertaken Triple P parent training. This qualitative study used 'In My Shoes', a computer assisted interview tool, to explore the experiences of eleven children from England aged between five and sixteen years. Children's data were analysed using Thematic Analysis. Children's themes were; a search for a cause; changes in life brought about by Triple P and wider difficult life circumstances. Parents and children's narratives broadly agreed though children talked about being smacked before Triple P and parents did not comment about chastisement. The final section of the thesis was a critical appraisal of the literature review, research study and research process as a whole, including methodological reflections, implications for future research and clinical practice, and the researcher's personal reflections in undertaking the research.