The Psychogeriatric Assessment Scales (PAS) provide an assessment of the clinical changes seen in dementia and depression. Three scales are derived from an interview with the subject (Cognitive Impairment, Depression, Stroke) and three from an interview with an informant (Cognitive Decline, Behaviour Change, Stroke). The PAS Summary Profile sheet indicates graphically correspondence between scale scores and clinical diagnoses and to aid the interpretation of individuals' results in terms of norms. The PAS is easy to administer and score and can be used by lay interviewers. The scales are suitable for application both in research and in services for the elderly.