Growth in membership and intensifying responsibilities require much greater adaptability in organizational structures and administrative arrangements at international than at national levels. The ongoing transformation toward multilevel governance seems to empower international organizations and thus shines a new spotlight on international civil servants. We know little, however, about what motivates this growing class of bureaucratic elite. Against this background, this article explores the question as to how officials of the European Commission relate to the recent management modernization within their institution (Kinnock reform). Competing explanatory approaches (opportunity, socialization, and governance views) are used to develop hypotheses about the relationship between Commission officials and their acceptance of or opposition to administrative reform. The main finding is that the individual attitudes of Commission officials toward administrative change can best be explained by the opportunity model, which emphasizes the rational calculation of individual costs and benefits.