The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.Abstract: Schools are places where children can learn behaviour, skills and attitudes that have lifelong relevance. In England, despite the continuing emphasis on attainment, there are clear moves to consider also the wider and non-cognitive outcomes of schooling -such as pupils' development of trust, critical thinking and civic-mindedness. However, there is little existing evidence on how such non-cognitive outcomes can be improved through school-based interventions. This paper presents findings from a quasi-experimental design using 2,722 pupils in 42 primary schools. A treatment group of schools participated in Philosophy for Children (P4C) for 18 months, whereas the other group of schools was a clean 'control'. The outcomes compared were pupil self-reports with an instrument designed to assess 'social and communication skills', 'team work and resilience' and 'empathy' and a number of other such constructs. Post-intervention comparisons show that pupils who received the P4C intervention were ahead of their counterparts in the comparison schools in many important respects, and this was generally more so for those pupils living in relative poverty (FSM-eligible). Teachers reported that positive effects could be observed in pupils' confidence in questioning and reasoning, both in P4C sessions, and in other lessons, and pupils generally reported that they enjoyed the intervention. However, the differences are small, and it is not clear that the two groups were comparable at the outset. Therefore, the results need to be interpreted with considerable caution. Nevertheless, there is promise that targeted school-based intervention such as P4C can improve pupils' non-cognitive outcomes, and there are lessons for how to conduct to such studies, and how to assess the wider outcomes of schooling.