There are as many ways to operate AD/AS as there are jurisdictions which have legalised it, but there are two distinct models: one limiting its availability to those with a terminal illness and the other adding provision for unbearable suffering. What has become clear to us is that better data collection, independently verified and overseen by a dedicated body, leads to a better understanding of how the whole AD/AS process is working. The overall trend is that numbers of AD/AS will increase from the time of introduction, but opinions differ about the cause of the increase. Many of the jurisdictions we have looked at introduced AD/AS very recently, and there is still much to learn as time passes. (Paragraph 144) Involvement of physicians and assessments of eligibility and capacity to give informed consent