The focus of this article is on the link among theory, process, and outcome in the practice of Emotionally Focused Therapy (EFT) for couples. We describe the EFT model of change and the EFT perspective on adult love as the reflection of underlying attachment processes. We outline the manner in which theory and research inform EFT interventions. This leads into a detailed review of the literature on the processes of change in EFT. We highlight the client responses and therapist operations that have emerged from process research and their relation to treatment outcomes. We discuss the implications of this body of research for clinical practice and training.