Examined the psychometric properties of the Schema Questionnaire-Short Form (SQ-SF; J. E. Young, 1998), a shorter version of the original questionnaire designed to measure 15 early maladaptive schemas, with a sample of 196 patients (aged 18-63 yrs) in a psychiatric day treatment program. It is noted that the maladaptive schemas measured by the Schema Questionnaire are thought to be important in the development and maintenance of psychiatric symptoms, such as anxiety and depression. The factor analysis supported the 15 schema subscales proposed by Young. These 15 subscales demonstrated good internal consistency. The present study also examined the relationship between the SQ-SF subscales and psychiatric symptomatology. Results provided support for the construct validity of the SQ-SF, suggesting the importance of maladaptive schemas in the development and maintenance of psychiatric symptoms.