“…Providing a detailed and clear explanation without being too exhaustive (Horvath, 1990), mentioning that it is a modern and empirically supported treatment, and using technical language and clinical cases to describe it, is suggested to enhance the client's expectations, self-efficacy, and engagement in therapeutic tasks (Ahmed & Westra, 2009;Ametrano et al, 2017;Kazdin & Krouse, 1983). Rationales focused on the client's specific complaints (Yulish et al, 2017), adapted to the client's beliefs (Wampold, 2012) and culture (Benish et al, 2011), accompanied by charismatic nonverbal behaviors, are thought to be persuasive (Heide, 2013;Otterson, 2015) and stimulant emotionally (Neumann & Strack, 2000). Despite the importance of communicating the rationale and previous attempts at measuring the psychotherapist's persuasiveness (Anderson & Patterson, 2013;Packwood & Parker, 1973;Truax et al, 1968Truax et al, , 1970, there still is not a psychometrically sound scale that explicitly measures the psychotherapist's persuasiveness (Vaz & Sousa, 2021).…”