Because 90% of physical aggression is preceded by verbal aggression, the aggression detector allows for rapid response to escalating situations. This aggression detector is capable of recognizing aggression in a person’s voice. Staff can thus be warned at an early stage, if someone is beginning to show signs of aggression. The system automatically and objectively detects (rising) human aggression, anger or fear, warns staff immediately (by a visual alert or by triggering an alarm) so that physical aggression can be prevented. It makes the problem of aggression measurable (reports).