This study presents a non-systematic review of literature on psychotherapy assessment studies, describing and discussing the three main features for its undertaking: efficiency, effectiveness and process. The results showed a significant evolution in the development of research on the subject beginning with pioneering studies, progressing through efficiency and effectiveness studies (which are still current and dominant) and arriving at the study of the psychotherapy process, especially through case studies conducted in a variety of fashions. However, it may also be observed that many doubts and unanswered questions persist in the psychotherapy assessment research field. New investigations into the psychotherapeutic process may help to close these gaps.
Psychotherapy; Efficiency; Effectiveness and psychotherapeutic process