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The improved characterization of populations exposed to social, economic, or environmental risk represents a new research challenge for the various disciplines that work in this area, in order to improve policies for prevention and adaptation. Each discipline has its own conceptual approaches and specific methodologies. Nonetheless, taking in the complexity of the phenomena makes such vulnerability an interdisciplinary object of study, understood through integrated approaches applied at multiple scales and that combine different temporalities. Drawing on field studies in developing countries, the authors demonstrate the methodological consequences of measuring different types of vulnerability. They also explore how it might be possible to link the social vulnerability of individuals and households to the vulnerability of the ecosocial systems of which they form a part.