This study was conducted to test Bordin's (1983) proposition that, in supervision, counselor trainees' perceptions of the supervisory working alliance (goals, tasks, and an emotional bond) are predictive of supervisory outcomes (trainee self-efficacy and trainee satisfaction with supervision) over time. Beginning practicum to intern level counselor trainees (N=107) completed the Working Alliance Inventory, the Self-Efficacy Inventory, the Trainee Personal Reaction Scale, and a demographic questionnaire that also assessed trainee experience level. The results indicated that changes in the supervisory working alliance were not predictive of changes in trainee self-efficacy. Changes in the supervisory working alliance, however, were predictive of trainee satisfaction with supervision. Bordin's model and theoretical propositions were supported by the findings in that the supervisory working alliance was significantly related to one aspect of supervision outcome. The results seemed to provide evidence which suggests that the supervisory working alliance changes over time and this change needs to be considered when evaluating its effectiveness. (NB)