This report by the International Center for Research on Women (ICRW) presents findings from baseline studies conducted among 15-16 year-old male students participating in the Young Men's Initiative (YMI) programme in Bosnia and Herzegovina, Croatia, Kosovo and Serbia. Participants from six technical schools across these countries were surveyed on their attitudes towards gender roles, homophobia and violence, as well as their knowledge about sexual and reproductive health and their experience with drugs and alcohol use. According to the findings, a majority of respondents hold traditional views on gender roles and homophobic beliefs. In several schools, a majority of respondents indicated that they had perpetrated violence against other boys or young men, though only a minority agreed with justifications for violence against an intimate partner. The findings also suggest significant gaps in basic knowledge about sexual and reproductive health and frequent alcohol use among young male students in this region.