"Capacity is the ability to understand information relevant to a decision and the ability to appreciate the reasonably foreseeable consequences of a decision (or lack of a decision). The purpose of the Aid to Capacity Evaluation (ACE) is to help clinicians systematically evaluate capacity when a patient is facing a medical decision.
The developers of the ACE:
The ACE was developed with the support of the physicians of Ontario through a grant from the Physicians' Services Incorporated Foundation."