The present study is based on a quasi-experimental research design and presents the results of an evaluation of Antidiscrimination and Diversity Training that took place at the Faculty of Education in Ljubljana, rooted in the anti-bias approach to educating diversity and equality issues (Murray & Urban, 2012). The experimental group included 52 in-service early childhood teachers attending the training, which consisted of a total of 120 hours. There was also a control group comprising 130 teachers. The ADT had a decisive impact on all of the measured variables: on an improvement in the participants' knowledge of discrimination, and on increased support for positive measures and for the preservation of the cultural traditions and language of immigrant children. It was found that self-assessed personality characteristics are predictors of the teachers' beliefs, especially the "enjoying awareness of cultural differences" variable, which correlates with all of the dependent variables.