Minor aggression is common in a closed female villa in a hospital for the mentally handicapped. In this study it occurred most frequently between 8a.m. and 10p.m. with a lunch-time peak. More incidents occurred on Saturday than on any other day. Few of the patients were psychotic and incidents were related to meal-times and reduced supervision. The most common targets for aggressive behaviour were property and the patient herself. The most common locus for aggression was outside the Sister's office. Attention to improving communication skills and providing more supervision should help to reduce the level of aggression.
