Background. Theory is important to the growth and evolution of occupational therapy. However, use of theory remains challenging for many therapists. Purpose. The aim was to develop a process that occupational therapists could apply to advance theory in practice. Method. Based on a review of the literature and using a qualitative instrumental case study design, 18 student occupational therapists and eight fieldwork educators completed online modules on the theory advancement concepts generated from the literature, wrote journals, and/or participated in online discussions during fieldwork. Following fieldwork, educators were interviewed and students participated in focus groups exploring their experiences. Directed content analysis was used to analyze the data. Findings. Based on the data collected, we developed the Theory Advancement Process (TAP). The TAP is composed of four primary contexts, a climate of collaborative relationships with four key elements, and four essential processes. Implications. The TAP presents a collaborative process for students, faculty, and therapists to work together to advance the use of theory in practice.