Husted, Gladys L. and James H., nursing theorists who developed the Symphonological Bioethical Theory and the Symphonological Model for Ethical Decision Making. Symphonology is the system of ethics inherent in the mutual commitments and obligations agreed upon by the health care professional and patient. Central to this implicit agreement are the needs of the patient. Bioethical standards include autonomy, beneficence, fidelity, freedom, objectivity, and self-assertion. The model is designed to provide nurses and other health care professionals with theoretical guidelines for ethical delivery of care.