This is the first round of the IBBS Survey conducted among street involved children and youths in three districts in the Kathmandu Valley of Nepal. This survey is a part of the National HIV Surveillance Plan (2012) and National HIV and AIDS Strategy (2011-2016). The first round of the survey was undertaken to determine the prevalence of HIV infections and to assess the sexual and/or injecting behaviors related to HIV among street involved children and youths in the Kathmandu Valley.