is a contextual therapy that is part of the so-called third generation therapies (Hayes, 2004; Pérez-Alvarez, 2012). One key feature is to reconsider the therapeutic context itself as the fundamental interaction for a change in behaviour to occur. The functional analysis of the therapeutic relationship is proposed as fundamental as it assumes that the clinical setting is a natural condition where a client's problems may occur, and also an opportunity for the client to make improvements. FAP is an idiographic therapy, which is based on the principles of functional analysis of a client's behaviour during the session. It includes contingencies of natural reinforcement and shaping that happen within the clinical session itself. In addition, FAP establishes the functional equivalence of the behaviour in the context of a session with other outside behaviours, which occur during the daily life of an individual (Kohlenberg & Tsai, 1991, 1995). The change process focuses on a client's direct behaviour, what the client does and/or says within the session (including talking, thinking, feeling, seeing, hearing, remembering, emotional responses, etc.), which are the so-called "clinically relevant behaviours" (CRB). There are three types of these behaviours, which the therapist must learn to identify as therapeutic goals (Kohlenberg & Tsai, 1991, 1994, 1995; Kohlenberg et al., 2009). CRB type 1 are the client's problems that are revealed during the session, usually complaints and problems that cause him/her to suffer, and whose frequency should Clínica y Salud (2021) xx(x) xx-xx

Philosophically, FAP is based on the principles of radical behaviorism and contextualism. It emphasizes contingencies that occur during a session of therapy, in a therapeutic context and also emphasizes the functional equivalence between the two environments as well as natural reinforcement and shaping (Kohlenberg & Tsai, 1991, 1995a). FAP proposed therapeutic targets called Clinically Relevant Behavior (CRB) (Kohlenberg & Tsai, 1991). There are three types of CRB. CRB1 are the client´s problems that occur during the session. CRB2s are the client's improvements occurring during the session. CRB3s are the clients' interpretations about their own behavior that also include the causes. Also five Therapeutic Rules for therapists are proposed. They involve identifying, evoking, reinforcing, noticing the impact of reinforcement, and interpreting the client's behavior. Many case studies have supported FAP (see Baruch, Kanter,

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in relation to the concept of the experience of personal self as socially and verbally constructed. This paper presents a reliability and validity study of the EOSS with a Spanish sample (582 participants, 18 to 70 years old; 198 men and 384 women), gathered from different cities, universities and clinical centers. The clinical sample consisted of 162 people undergoing psychological or psychiatric treatment and 420 people without problems. Standard questionnaires (Eysenk Personality Questionnaire-Revised, Rosenberg Self-Esteem and Dissociative Experiences Scale) which measure similar self-concepts were used to explore the validity of the EOSS. The results show high internal reliability (Cronbach's ǭ DQG ERWK KLJK DQG VLJQLƂFDQW correlations with the "neuroticism" scale of the EPQ-R (.212, p<.001), "dissociation» of the DES (r=.483, p<.001) and negative self-esteem of the RSES (r=-.544, p<.001). The partial and total scores of EOSS also differentiated the clinical sample with high scores from the standard sample (t=7.78, p<.001). In conclusion, the EOSS has high internal reliability, high validity with similar self-concept scales, and it is also useful for evaluating people with psychological problems of self.

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