The purpose of this study is to examine the effects of superior supervision on social workers' professional efficacy in social welfare organizations. This study collected survey data from social workers, and statistically analyzed the effects of Kadushin's three functions of supervision affecting social workers' professional efficacy. Among the three functions of supervision (administrative, educational, and supportive), the mean of supportive supervision is the highest of all. The means of

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... subcategories of social workers' professional efficacy are high in client support efficacy, practice theory efficacy, practice skill efficacy, research efficacy, in descending order. According to the results of regression analysis, the regular provision of supervision affects both practice theory efficacy and research efficacy. Another finding is that educational supervision has significant effects on all the four subcategories of professional efficacy. Finally, this study emphasizes the importance and immediate necessity of supervision to strengthen social workers' professional efficacy.