Faye Glenn Abdellah was a pioneering nurse who developed a "typology of 21 nursing problems" to identify and classify common patient needs and guide nursing care. Her framework categorized problems into physical, sociological, emotional needs; nurse-patient relationships; and elements of patient care. Abdellah believed this typology would provide a method to evaluate nursing students' experiences and competencies. Some of the 21 problems addressed basic needs like hygiene, activity, and safety, as well as sustaining needs such as nutrition, elimination and regulatory functions, and remedial needs such as communication and spiritual goals. Abdellah's theory stated that nursing involves using problem-solving to address patients' health needs through key nursing