The purpose of this report is to study Peer Mediation efforts in the United Kingdom. From this study, I learnt 1) How to introduce peer mediation, 2) How to collaborate between elementary school and junior high school, 3) Educational system to support the introduction of peer mediation. In order to introduce peer mediation into school it is important to understand multiculturalism and understand religion. In the UK school, for this understanding, citizen ship education and PSHE are introduced. In order to introduce peer mediation at Japanese schools, it was suggested that education to understand other people such as citizen ship education and PSHE is important.