Empirical research into the efficacy of ISTDP, and other brief psychodynamic psychotherapies is active. Besides pharmacotherapy, electroconvulsive therapy, psychotherapies and family interventions are routinely employed. Cognitive behavioral therapy and other psychotherapies developed. Common factors is one route by which psychotherapy researchers have attempted to integrate psychotherapies. There are different forms of psychoanalysis and psychotherapies in which psychoanalytic thinking is practiced. For psychotherapies and other behavioral and psychological intervention methods, see list of psychotherapies. For this reason Gestalt therapy falls within the category of humanistic psychotherapies. Some psychotherapies are based on a humanistic approach. Certain psychotherapies are considered evidence-based for treating some diagnosed mental disorders. Trauma-Focused Cognitive Behavior Therapy (TFCBT) and more effective than the other non-TFCBT psychotherapies. The utility of PTSD-derived psychotherapies for assisting children with C-PTSD is uncertain. Several patient and therapist factors appear to predict suitability for different psychotherapies. It is not yet understood how psychotherapies can succeed in treating mental illnesses. The study concluded that twelve-step facilitation was as effective as the other psychotherapies studied. It contains clinical vignettes of the "talking cure" in action from real psychotherapies.