The North American Nursing Diagnosis Association (NANDA) has been identifying, classifying, and testing diagnostic nomenclature since the early 1970s. In our opinion, use of nursing diagnosis helps define the essence of nursing and give direction to care that is uniquely nursing care. If nurses (in all instances we are referring to registered nurses) enter the medical diagnosis of, for example, acute appendicitis as the patient’s problem, they have met defeat before they have begun. A nurse cannot intervene for this medical diagnosis; intervention. requires a medical practitioner who can perform an appendectomy. However, if the nurse enters the nursing diagnosis “Pain,” then a number of nursing interventions come to mind. Several books incorporate nursing diagnosis as a part of planning care.