Collaboration has been a frequently used construct to describe the practices of different therapeutic approaches for working with clients. Missing, however, is a sense of how collaboration is enacted in dialogues between therapists and clients. After defining ‘collaboration’, we analyse the actual conversational practices of Karl Tomm in his work with a couple, using conversation analysis. Our aim is to highlight the conversational accomplishment of collaboration in observable ways that we feel may be linked to enhancing one’s conversational and collaborative practice of therapy.