Local monitoring in Swansea, Wales has identified a strong link between school exclusion and youth offending. This precipitated the establishment of the Promoting Positive Behaviour (PPB) initiative. A questionnaire based on the Mooney Problem Checklist (MPCL) was completed by 162 (124 control and 38 experimental) Year 10 and Year 11 pupils in Swansea. The research investigated differences in the extent of problems experienced by pupils who had been excluded from school and those who had not. Results show that pupils in Swansea who have been excluded report a range of problems at higher levels than non-excluded pupils. This indicates that PPB’s focus upon reducing disaffection and maintaining young people in schools may ameliorate problems and prevent associated problem behaviours such as offending.