Abstract : A measure of social support, the Social Support Questionnaire (SSQ), is described and four empirical studies employing it are described. The SSQ yields scores for (a) number of social supports, and (b) satisfaction with social support that is available. Three of the studies deal with the SSQ's psychometric properties, its correations with measures of personality and adjustment, and the relationship of the SSQ to positive and negative life changes. The fourth study was an experimental investigation of the relationship between social support and persistence in working on a complex, frustrating task. The research reported suggests that the SSQ is a reliable instrument, and that social support is (1) more strongly related to positive than negative life changes, (2) more related in a negative direction to psychological discomfort among women than men, and (3) an asset in enabling a person to persist at a task under frustrating conditions. Research and clinical implications are discussed. (Author)