Dorothea Orem was an influential American nurse theorist born in 1914. She developed the Self-Care Deficit Nursing Theory, which has three major concepts: self-care, self-care deficits, and nursing systems. Orem defined nursing as assisting individuals with meeting their healthcare needs when they are unable to independently care for themselves. Her theory focuses on promoting patient independence through addressing universal, developmental, and health-deviation self-care requisites.