Patient-initiated premature treatment discontinuation, which occurs when patients decide to end psychotherapy before agreed-upon treatment goals have been reached (Kazdin, 1996;Ogrodniczuk, Joyce, & Piper, 2005), is considered a major challenge for psychotherapy practitioners of all orientations (Roseborough, McLeod, & Wright, 2016;Swift & Greenberg, 2012). Despite considerable research into the phenomenon over five decades, patient discontinuation is still poorly understood and difficult to prevent (Barrett, Chua, Crits-Christoff, Gibbons, & Thompson, 2008;Kegel & Fluckiger, 2015). Furthermore, there appear to be no significant differences in discontinuation rates when comparing psychotherapy treatment modalities, settings, patient types and therapist characteristics (Wiersbicki & Pekarik, 1993).The term "discontinuation" is often used interchangeably with "termination", "attrition", "dropout" and "disengagement"