The Working on What Works (WOWW) approach, which is based upon Solution-focused Brief Therapy, was implemented in a mainstream primary classroom over a 10-week period. The focus was on improving behaviour and relationships in class. Results demonstrated an improvement in teacher ratings for targets set by the class teacher compared with baseline. Pupils also set, and rated themselves on class targets. Observation of pupils, and their class-ratings, demonstrated a positive impact for these targets. Longer term follow-up suggested that this positive impact was maintained. It is concluded that WOWW had a positive impact on behaviour and relationships within this classroom. (Contains 2 figures and 1 table.)