The essay provides a comprehensive account of the Heidelberg International Comprehensive School as Peace School and UNESCO Project School. First of all there is an outline of the main factors influencing the establishment of the school in 1974, these being certain approaches within the framework of education reforms, as well as the resulting Peace Education aspects. Following this there are some insights into the planning phase, which involved amongst others the Ministry of Education, The Lord Mayor, the Planning Group made up of academics, representatives of the teaching staff and parents. Examples of practice within the school are discussed; the practice is typified by its international character, e.g. links with schools in other countrie...