In this article, Horvath & Luborsky (1993) explained that the therapeutic alliance, defined broadly as the collaborative bond between therapist and patient, is widely considered to be an essential ingredient in the effectiveness of psychotherapy. In the ongoing debate about the relative importance of modality-specific techniques versus common factors for therapeutic success in all psychotherapies, the therapeutic alliance has been described as the most promising of the common elements for future investigation (Horvath & Luborsky, 1993) and as the quintessential integrative variable (Horvath & Luborsky, 1993) in that it is believed to influence outcome across ...