Effective services for students who are deaf or hard of hearing depend on uniquely skilled professionals who coordinate their support. University programs have developed interdisciplinary models, training different types of professionals together to equip them for work settings that are increasingly inclusive and collaborative. These training programs address standards-based knowledge and skills from various disciplines, but may not be as deliberate in addressing the professional dispositions that are foundational to collaborative practice. Particularly when belief systems intersect topics of language use and identity, dispositions can be challenging to teach and are often applied differently across professions. This article provides a narrative description of an interdisciplinary training program that equips teachers of the deaf and speech-language pathologists. Using a "self-reflective cycle" representative of participatory-action research, it considers both missteps and successes within a continuous improvement process, and the integration of interdisciplinary dispositions as a foundational component of training. A framework of "What to Teach," Why to Teach It," and "How to Teach It" is provided that can be embedded or adapted for similar interdisciplinary training programs. The identified dispositions are informed by research-based best practices and center on inclusivity.