Psychotherapy, such as cognitive-behavioral therapy (CBT), is effective in treating various mental disorders. Technology-facilitated mental health therapy improves client engagement through methods like digitization or gamification. However, these innovations largely cater to individual therapy, ignoring the potential of group therapy-a treatment for multiple clients concurrently, which enables individual clients to receive various perspectives in the treatment process and also addresses the scarcity of healthcare practitioners to reduce costs. Notwithstanding its cost-effectiveness and unique social dynamics that foster peer learning and community support, group therapy, such as group CBT, faces the issue of attrition. While existing medical work has developed guidelines for therapists, such as establishing leadership and empathy to facilitate group therapy, understanding about the interactions between each stakeholder is still missing. To bridge this gap, this study examined a group CBT program called the Serigaya Methamphetamine Relapse Prevention Program (SMARPP) as a case study to understand stakeholder coordination and communication, along with factors promoting and hindering continuous engagement in group therapy. In-depth interviews with eight facilitators and six former clients from SMARPP revealed the motivators and demotivators for facilitator-facilitator, client-client, and facilitator-client communications. Our investigation uncovers the presence of discernible conflicts between clients' intrapersonal motivation as well as interpersonal motivation in the context of group therapy through the lens of self-determination theory. We discuss insights and research opportunities for the HCI community to mediate such tension and enhance stakeholder communication in future technology-assisted group therapy settings.

翻译：心理治疗，如认知行为疗法（CBT），在治疗多种精神障碍方面是有效的。技术辅助的心理健康治疗通过数字化或游戏化等方法提升了来访者的参与度。然而，这些创新主要服务于个体治疗，忽视了团体治疗的潜力——一种同时治疗多位来访者的方式，它能让个体来访者在治疗过程中获得多元视角，同时也能应对医疗从业者短缺的问题以降低成本。尽管团体治疗（如团体CBT）具有成本效益以及促进同伴学习和社区支持的独特社会动力，但它面临着参与者流失的问题。虽然现有的医学工作已为治疗师制定了指导原则（例如建立领导力和同理心以促进团体治疗），但对于各利益相关者之间互动的理解仍然缺失。为弥补这一空白，本研究以名为“Serigaya甲基苯丙胺复发预防计划”（SMARPP）的团体CBT项目作为案例，旨在理解利益相关者的协调与沟通，以及促进和阻碍团体治疗持续参与的因素。通过对SMARPP的八位引导者和六位前来访者进行深度访谈，我们揭示了引导者之间、来访者之间以及引导者与来访者之间沟通的促进因素与阻碍因素。我们的研究通过自我决定理论的视角，揭示了在团体治疗情境中来访者内在动机与人际动机之间存在可辨别的冲突。我们讨论了为人机交互（HCI）领域提供的见解与研究机遇，以在未来技术辅助的团体治疗场景中调解此类张力并增强利益相关者之间的沟通。