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The purpose of this article is to determine whether the positive association between social support and well-being is attributable more to an overall beneficial effect of support (main-or direct-effect model) or to a process of support protecting persons from potentially adverse effects of stressful events (buffering model). The review of studies is organized according to (a) whether a measure assesses support structure or function, and (b) the degree of specificity (vs. globality) of the scale. By structure we mean simply the existence of relationships, and by function we mean the extent to which one’s interpersonal relationships provide particular resources. Special attention is paid to methodological characteristics that are requisite for a fair comparison of the models. The review concludes that there is evidence consistent with both models. Evidence for a buffering model is found when the social support measure assesses …