One of the major objectives of the European FP6 BIOHEAD-CITIZEN project on “Biology Health and Environmental education for better citizenship” (STREP, CIT2-CT2004-506015, Carvalho et al. 2004) is to analyse the potential differences between countries by associating teachers’ and future teachers’ conceptions to controlled parameters, such as level of training, religion, political view and the broad socio-cultural context. A questionnaire was constructed with the participation of all Biohead-Citizen project research teams. The original English version was translated into each national language and after validation of the translation it was pre-tested before implementation in each country. A total of 6379 teachers and future teachers responded...