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Objectives Measuring severity of psychopathological symptoms using self-assessment questionnaires is important for clinical and scientific research. However, there is no widely-available Polish tool which measures both overall functioning and severity of a broad spectrum of psychopathological symptoms. This paper describesthe designing of such a tool -the General Functioning Questionnaire (GFQ-58). Methods Three studies were conducted to verify the validity and reliability of the GFQ-58 (1)a study comparing 30 individuals diagnosed with