Melanie Klein and Donald Winnicott were two renowned psychoanalysts who contributed significantly to the field of psychology. Klein's work focused on child psychology, exploring the development of psychic states operating at an unconscious level. She emphasized the importance of early childhood experiences in shaping later personality traits. Winnicott, on the other hand, developed theories that applied to both child and adult psychology, highlighting the significance of environmental factors in shaping individual development. Winnicott's concept of the 'false self' suggests that a person develops a sense of self based on the quality of care received from their mother. If this care is poor, it can lead to an unhealthy false self. Both psychoanalysts agreed that the child's transition from undifferentiated unity to independence was crucial for development. Klein viewed this process as driven by guilt and reparation, while Winnicott saw it as a gradual disillusionment with the initial illusion of being one with the mother figure.