This part introduction presents an overview of the key concepts discussed in the subsequent chapters. The part provides a snapshot of an institution the reputation of which as a provider of high-quality mental health care and training is undisputed, and yet its survival in its current form as a relatively small Mental Health Trust is uncertain. It illustrates an impressive capacity to adapt to new demands and social realities that challenge the limits of any one therapeutic modality or mode of service delivery. The part presents the value of integrating different ways of working and the importance of collaboration with other organizations/services in order to meet the challenge of complexity. Adaptations of the psychoanalytic model of intensive psychotherapy/analysis may understandably mobilize a range of anxieties. Such adaptations seem to arouse concern that psychoanalysis will be damaged by the intrusion of other ways of theorizing, thinking, and practising.