[영문]Effective supervision is a vital aspect of service delivery in social service organizations. This article provides a meta?analysis of 27 qualified research articles published between 1990 and 2007. The analysis thus includes a combined sample of 10,867 workers in child welfare, social work, and mental health settings. The results indicate that supervisory dimensions of task assistance, social and emotional support, and supervisory interpersonal interaction are positively and statistically significantly related to beneficial outcomes for workers. The dimensions of social and emotional supervisory support and supervisory interpersonal interaction are found to be negatively and statistically significantly related to detrimental outcomes for workers. All effect sizes were moderate (r at the 0.30 to 0.40 range). These findings underscore the importance of effective supervision in fostering beneficial outcomes and in limiting detrimental outcomes for workers. They also indicate that social service agencies should devote resources to training supervisors across all supervisory dimensions.