Final answer:
In the context of nursing models, when an RN assigns tasks and supervises other nurses and nursing assistants, it's known as delegated nursing. This includes important responsibilities like patient assessment and treatment oversight.
Step-by-step explanation:
The model of nursing care in which a Registered Nurse (RN) determines the patients' or residents' nursing needs and assigns tasks to other nurses or nursing assistants is known as delegated nursing. The RN provides direct supervision and is responsible for overseeing patient care, including crucial tasks such as reviewing patient history, monitoring treatment processes like dialysis, assessing needs, and ensuring the use of sterile procedures.