The proposed study is part of a wider application to the MRC for a postdoctoral Special Research Training Fellowship in Health Services and Health of the Public Research. The overall theme of the application is the causes of emotional distress in early to mid adolescence and the support needs of those who experience this, with a particular focus on the school context, in terms of risk factors and potential avenues of support. The aim of this particular study is to assess incidence and school-related risk factors for deliberate self-harm in 14-15 year olds in ALSPAC. The young people in the sample have already been asked during their clinic interviews at age 11 about episodes of self-harm and suicidal thoughts (frequency, timing and nature of episodes). The children were asked the following questions: (a) "Have you thought of killing yourself?" (b) "Have you ever hurt yourself on purpose?" (c) "Have you ever made plans to kill yourself?" (d) "Have you actually tried to kill yourself?". I propose to build on this data, by including several questions in the questionnaires to be sent out to the ALSPAC teenagers at age 14-15 years.