Clinical supervision of trainees in the field of psychology is a crucial and required component of the training process. Yet, despite its ubiquity within the field, research on the factors that contribute to positive and negative supervisory experiences from the perspective of the trainee is relatively sparse. This is particularly true in terms of trainee willingness to disclose during supervision and the impact it has on supervisees' sense of self-efficacy, particularly in the context of their perceptions about stressors they may be dealing with. This study therefore investigated the relationship between psychology doctoral-level supervisees' perceptions of the supervisory relationship, particularly rapport, and stress with their perception of their self-efficacy and willingness to disclose during clinical supervision. It was hypothesized that greater levels of trainee perceived stress and negative perceptions of supervision would both be associated with lower levels of trainee willingness to disclose and lower perceptions of self-efficacy. Findings of this study demonstrated support for the significant positive relationship between trainees' perception of the supervisory relationship on reported self-efficacy and willingness to disclose. A negative correlation was seen between supervisee perception of stress on their self-efficacy and willingness to disclose, as well as their perception of the working alliance with the supervisor. Limitations of this study include trainees' interpretation of the self-report measure and questionnaire items, as well as the potential for less straightforward responding due to a desire to protect the supervisor or maintain a positive impression of themselves as a clinician. Leaving room for future research is needed to shed additional light on factors that may influence trainee perspectives on their clinical supervision experience. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]