Observational and interview data obtained from nurse caregivers and family members of patients with late-stage Alzheimer's disease were analyzed to explicate the nursing role in advance proxy planning. A four-phase model, Achieving Consensus: Decision Making to Determine Treatment Options for Patients with Alzheimer's Disease, was developed. Patient decline, family coping, professional development of nursing staff, and nursing unit philosophy were community characteristics found to be important antecedents to the process of reaching consensus. Achieving consensus constructs included interactive process components of patient, family, and staff adjustment, caring, and knowing. Timing and trust were influential catalysts to family and staff readiness factors for achieving consensus. Outcomes were the advice provided by staff and the family conference where treatment options were determined. Consequences included the advance proxy plan and patient care.