This study aims to present a historical and conceptual analysis of the terms Analytical Behavior Therapy (ABT) and Cognitive Behavior Therapy (CBT), to examine their similarities and divergences in therapy sessions and establish relationships between the theory and psychotherapy. To reach these aims, two studies will be conducted. The first study will be a literature review, whose sources will be texts found at three Libraries (at Cognitive Behavioral Research and Intervention Laboratory, at Núcleo Paradigma and at University of São Paulo) and at Portal CAPES. The history of these two theoretical approaches will be written, focusing on the similarities and divergent points. The second study will evaluate the similarities and differences in psychotherapy. It will be invited to participate the study: 6 therapist-client dyads (3 ABT and 3 CBT) and 6 more therapists of each approach, to act as judges in the analysis of the sessions. Six psychotherapy sessions of each dyad will be recorded, transcribed and analyzed according to the Multidimensional system for the categorization of behaviors in the therapeutic interaction. After categorization, the concordance index will be calculated and the categories whose Kappa coefficient be equal or greater than 0.60 will be analyzed. The frequency of occurrence and duration of each category will be counted, and it will be conducted speech content in each category; lastly, the sessions from both approaches will be compared. The results of the two studies will be related, to check on if in the history of each of the approaches, there are data that enable understand the similarities and differences found in the sessions. It's expected to point out the historical explanations for similarities and differences and thereby reduce the epistemological mistakes between these approaches.
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