Forced termination precipitated by interns' departure is prominent yet challenging due to the way it "feels" to leave clients prematurely. Educators endorse a triadic, relational, supervisory matrix for interns' in vivo learning, which situates instruction at the cleavage of the technical and affective aspects of the forced ending process. Lack of studies on supervisory practice is a gap in the literature investigated in this quantitative study of 119 supervisors' instruction of intern initiated forced termination. Both synthesizing and expanding upon the literature, key findings include a statistically significant model for teaching affective engagement in the ending process. Aligning with advancements such as, early disclosure, transcending historic tendencies foregrounding loss and separation, and relegating strong feelings to engagement, supervisors' high degrees of comfort, satisfaction and adequacy approaching feelings were ultimately discordant with less frequent employment of in vivo methods. The low frequency of the critical variable--teaching interns to share their own feelings and responses about ending with clients, also negligibly correlated with supervisors increasing sense of benefiting from more clinical/theoretical knowledge. Furthermore, overall trends leaned toward a favoring of technical over clinical/theoretical knowledge, despite clinical/theoretical knowledge deemed of high value and influence. Intern initiated forced termination was supervised most frequently: 81.5% all the time/often. Findings suggest future study foregrounding supervisory perspectives on integrating theory and practice, views on engaging with "parallel" phenomena, while investigating supervisors' use of existing conceptual knowledge operational in general practice. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]