International field placements are a unique educational opportunity for social work students to develop the skills they need for social work practice in a globalized world; however, outcomes of international placements have not been rigorously studied. This article reports on the International Volunteer Impacts Survey (IVIS), a 48-item survey administered to 983 respondents that measures perceived outcomes of international service. Using factor analysis procedures, the authors assess factor structure and reliability of major outcomes of international service including international contacts, open-mindedness, international understanding, intercultural relations, life plans, civic activism, community engagement, media attentiveness, and financial contributions. Further development of the IVIS and the implications for using it to assess student outcomes in international social work field placements are discussed. (Contains 4 tables and 2 figures.)