 This review found that interventions that provide social activity and or support within a group format, and those that are developed within the context of a theoretical basis, appear to be more effective than other types of interventions in alleviating social isolation in older adults. Additionally, interventions that involve older adults as active participants are more likely to produce beneficial effects. This article was authored by Greaves Collin J, Richard Cezanne H, Dickens Andy P, and others.