This definition of abnormality states that: individuals are abnormal when their behaviour suggests they cannot cope with basic demands of everyday life. Rosenhan’s Criteria for abnormality: 1. Person can no longer follow interpersonal rules(e.g. respecting personal space, maintaining eye contact) 2. Experiences severe personal stress 3. Becomes irrational and dangerous to self and others Often uses GAF scale to asses the functioning of patient socially, occupational and psychologically