Final answer:
Orem's theory is useful in designing interventions to promote self-care and is being used by the nurse to assess the patient's noncompliance.
Step-by-step explanation:
Orem's theory of self-care is useful in designing interventions to promote self-care, which is why the nurse is using it to assess the patient's noncompliance. Orem's theory recognizes that individuals have the capacity to care for themselves and should be involved in their own care. It allows for the development of a personalized plan of care that takes into account the patient's individual needs and preferences. By understanding the underlying cause of the patient's noncompliance, the nurse can tailor interventions to address the specific barriers to adherence.