This episode explores the interconnectedness of Motivational Interviewing (MI) and Self-Determination Theory (SDT), featuring Professor Richard Ryan, co-founder of SDT. The discussion begins by establishing the podcast and introducing Professor Ryan, who explains SDT as a broad motivation theory applicable across various fields, focusing on fostering intrinsic motivation and individual well-being. Against this backdrop, the hosts highlight a key difference between MI's earlier understanding of intrinsic motivation and SDT's more nuanced perspective, which distinguishes between intrinsically motivated actions and autonomously motivated actions driven by integrated values. More significantly, the conversation delves into the historical alignment between MI and SDT, emphasizing the shared emphasis on client autonomy and collaborative relationships. For instance, Professor Ryan recounts his initial encounter with MI and its congruence with SDT's principles. As the discussion pivots to potential points of divergence, the importance of avoiding outcome-focused approaches in favor of process-focused ones is stressed, ensuring that change talk arises from genuine client volition rather than external pressure. In contrast to a solely outcome-driven approach, the episode underscores the value of exploring sustained talk to understand clients' perspectives and identify barriers to change. This approach, rooted in empathy and unconditional positive regard, facilitates a deeper understanding of client motivations and fosters a more collaborative therapeutic relationship. Ultimately, this episode highlights the synergistic relationship between MI and SDT, offering valuable insights for practitioners seeking to enhance their understanding of client motivation and facilitate lasting behavior change. What this means for practitioners is a more nuanced understanding of client motivation and a shift towards process-focused approaches that prioritize client autonomy and genuine engagement.