This observational study aims to evaluate the effectiveness of two different psychotherapy approaches-Cognitive Behavioral Therapy (CBT) and Brief Strategic Therapy (BST)-in treating adolescents with psychological disorders. The study will follow adolescents aged 12 to 20 who are receiving psychotherapy as part of their routine clinical care at the IRCCS Centro Neurolesi "Bonino-Pulejo" in Messina, Italy. Participants will not be randomly assigned to a treatment; instead, their natural clinical path will be observed. Data will be collected through standardized psychological assessments at the beginning, during, and after the therapy, as well as at follow-ups at 3 and 9 months. The goal is to understand which therapeutic model is more effective in improving symptoms, quality of life, and self-esteem in adolescents, and how individual and family factors influence treatment outcomes.