What are the benefits of advance care planning? Theoretically, the process can facilitate patient autonomy so that patients' future wishes can be carried out once they can no longer decide for themselves, 1 but evidence regarding real benefit is mixed. A controlled trial of the impact of combining improved communication about resuscitation preferences with information on prognosis found no improvement in the quality of end of life care. 12 Other authors have suggested that the wider advance care planning process may also be ineffective in achieving positive outcomes. [13][14][15][16] Conversely, some evidence, including that from a recent small systematic review in patients with dementia and cognitive impairment, 17 points to several possible benefits. These include less aggressive medical care and better quality of life near death, decreased rates of hospital admission, especially of care home residents, and increased rates of hospice admission, 18-20 with those having completed an advance care plan being more likely to receive care that is aligned with their wishes. 21 22 A UK retrospective study of 969 deceased hospice patients found that those who had completed such a plan (57%) spent less time in hospital in their last year of life. It also found that those who died outside of hospital had a lower mean hospital treatment cost than those who died in hospital. 23 Advance care planning is also thought to help families prepare for the death of a loved one, to resolve family conflict, and to help with bereavement. 24 25 For example, a randomised controlled trial of facilitated advance care planning versus usual care in elderly patients in Australia showed that 86% of patients in the intervention arm had their end of life wishes known and respected compared with 30% in the control arm. The same study highlighted a greater level of satisfaction among patients and relatives in the intervention group. Family members of patients in the intervention group who died had lower levels of psychological morbidity. 25 A systematic review published in 2008 examined evidence for improving palliative care at the end of life. It included 41 articles relating to advance care planning and found moderate evidence supporting multicomponent interventions to increase patient uptake of advance directives; however, these studies seldom measured clinically important outcomes. The paper also concluded that