Children’s long term success at school is influenced as much by social, emotional and self-regulation skills as by academic skills and knowledge. The overall goal of SEED was to improve psychosocial well-being and healthy development of young children (2,5 to 6 years old), with an emphasis on those growing up in difficult circumstances such as children on the move, children with a low socio-economic status or children victims or witnesses of domestic violence. We did this by conducting a country level screening of psychosocial well-being of 5-year-old children in 5 countries in Europe.