The Supervisory Working Alliance Inventory (SWAI) developed by J. F. Efstation, M. J. Patton, and C. M. Kardash (1990) was further evaluated for its psychometric properties and relationships with the Personal Reactions Scale--Revised (PRS-R) developed by E. L. Holloway and B. E. Wampold (1984), the only other measure of the relationship in counselor supervision. The original factor structure of the SWAI was replicated on a sample considerably different from the one reported in the initial study. A sample of 65 supervisors (34 males and 31 females) and 88 trainees (20 males and 68 females) from university staffs returned completed instruments, which were supplemented by data for an additional 30 supervisors and 30 trainees from a university counseling center. Results suggest the suitability of the SWAI for use with participants of differing backgrounds and experiences. Correlations with the PRS-R indicate that the SWAI measures the supervisory relationship over more dimensions than the PRS-R, most notably focusing on trainees' understanding of clients. Two tables present means, standard deviations, factor loadings, eigenvalues, and variance for the two SWAI versions. (SLD)