During the fieldwork, beyond the school and class group surveyed, no additional information was collected that would enable the respondent to be identified. Once the surveys were carried out, partners were required to anonymise data. For the final common dataset, additional anonymisation of the name of the schools or locations was done.
Partners were required to conform to EU Directives on data protection (95/46/EC and 2006/24/EC) pertaining to the protection of individuals, and to keep abreast of proposed changes to the European data protection framework regarding the processing of personal data and the free movement of such data.