An innovative model that considers psychological immunity as the ability of a person to cope with psychological stress and life difficulties without breakdowns and the development of pathological symptoms. Kagan believes that psychological immunity is determined not only by obvious psychological factors, but also by the dynamic interaction between a person’s biological predispositions, cognitive and emotional characteristics, and the surrounding social environment. He argues that a child’s early experiences, such as parenting style and the quality of family relationships, directly contribute to the formation of the initial foundation of psychological immunity, developing the ability to regulate emotions, cope with fear and anxiety, and develop healthy coping strategies. Kagan also suggests that psychological immunity is not just a fixed trait, but a process that is updated and developed with experience, and that a person can strengthen it by opening up to social support, developing flexible thinking, and learning from failures and disappointments.