Dorothea Orem developed the Self-Care Deficit Theory of Nursing, which has three related parts: the theory of self-care, theory of self-care deficit, and theory of nursing systems. The theory proposes that nursing is needed when an individual is unable to independently meet their self-care needs. Orem identified different types of self-care requisites and proposed systems for how nurses can help meet patient's self-care needs either wholly, partly, or through education. The theory provides a framework for nursing practice, education, and research. It has been widely used and has influenced nursing practice and education.