The Good Childhood Report 2015 is the fourth annual report that we have produced in collaboration with the University of York. It comes from the most extensive and coherent national research programme on children’s subjective well-being in the world.Our research over the past ten years has generated a wealth of insights into why there are differences in children’s well-being. Personality accounts for some of these differences but is only part of the picture. Alongside this, we have found a range of individual family factors, life events, activities and behaviours to play a role. This year our research presents findings from a new international well-being study, which reveals problems children in England face at school and with their self image.