Dorothy Johnson developed the Behavioral Systems Model for nursing in the 1960s. She was influenced by Florence Nightingale and Hans Selye. The model views the person as a behavioral system made up of subsystems that strive for balance and stability. Nursing aims to foster efficient functioning to prevent and manage illness. The model identifies 7-8 subsystems and proposes goals, definitions, assumptions, and tools have been developed based on the theory, though it is limited in research and undefined outcomes.