MULU MARPs HIV Prevention activity was a $50 million, 5 years cooperative agreement implemented in Amhara, Oromia, SNNPR, Tigray, Addis Ababa, Afar, Somali, Gambella, Benishangul Gumuz, Harar and Dire Dawa by Population Service International to reduce the number of new HIV infections in Ethiopia by reducing behavioral risk factors among most-at-risk populations and other highly vulnerable populations by strengthening community- level systems and structures to support a combination of prevention and increasing the capacity of the Government of Ethiopia to lead HIV prevention interventions . ABH conducted formative research to inform program activities by collecting and analyzing information about the types of populations engaging in transactional sex in each target area, venues where individuals engaging in transactional sex could be reached with outreach activities, access to health care services among individuals engaging in transactional sex, the preparedness of health facilities to provide MARPS-friendly services, and potential behaviour change messages.