Treatment of ADHD typically focuses on alleviation of core symptoms. However, it is also important to consider how best to prevent and treat co-occurring mental health problems such as anxiety and depression. Development of effective preventative intervention however requires a good understanding of likely modifiable risk and protective factors that could be targeted in interventions in children and young people with ADHD. The project has potential to impact in two ways: i) by helping identify those children with ADHD problems who are at highest risk of later mental health problems and who are therefore a priority for early support and preventative intervention; and ii) by identifying potentially modifiable protective factors of relevance in this group that could be a focus for interventions that aim to optimize long-term mental health outcomes. The supervisory team have experience of developing impact work and forging links with educators and other stakeholders. Furthermore, the research team works closely with ADHD support groups, trains mental health practitioners, and also has strong links and experience of working with other stake holders such as schools, education authorities and Welsh Government.