Why does the girl not speak in kindergarten? Why does the boy remain silent during school? Selectively mute children have the ability to speak, but choose not to use it in unfamiliar situations or in the communication with certain people. A conversation with these children is often not possible at all or only via gestures or written messages. Nitza Katz-Bernstein elaborates in her book on the symptoms of this dysfunction and explains the diagnostics and different therapies. She takes into consideration therapeutic elements from various disciplines such as speech therapy, as well as different schools of child and adolescent psychotherapy.