In this chapter I shall look at some of the treatment recommendations and the implications for therapeutic technique which derive from the understandings of autism and psychosis which have been described by Tustin. I shall bring these considerations together with material from one of her cases, so as to present, as it were, a picture of the psychotherapist at work. A certain amount of clinical material concerning the case of Peter has already been published in her book Autistic States in Children (Tustin 1981). I draw on this as well as on other published sources and supplement the whole with observations based on my clinical conversations with Frances Tustin.