In conclusion, although there are many questions that remain to be resolved, there is compelling evidence that CBGT added to standard treatment is an effective method in the manage- ment of psychotic disorders such as schizophrenia or schizoaf- fective disorder. Even though this method does not seem tobe economical since it has to be administered by trained per- sonnel and the therapies consume longer time than medica- tion, .the evidence that CBGT decreases the number and du- ration of admisssions indicates cost-effectiveness. Moreover, the fact that short-term interventions yielded positive results increases the feasibility of this method for routine use.