Purpose: The need for psychometrically sound measurement approaches to social work educational outcomes assessment is increasing. Method: The research reported here describes an original and two replication studies of a new scale (N = 550) designed to assess an individual's self-efficacy regarding social work competencies specified by the Council on Social Work Education as part of the accreditation of social work programs. Results: This new measure, the Self-Efficacy Regarding Social Work Competencies Scale (SERSWCS), generally performed in line with our expectations. Discussion: The SERSWCS is a measure that is based on substantial theoretical and empirical work, has preliminary evidence regarding the psychometric properties of the data it produces, can be used with large numbers of students in an efficient manner, is neither expensive or subject to user restrictions, and provides views of outcomes that have utility for pedagogical considerations at multiple curricular levels.