Community Tools: Aid to Capacity Evaluation (ACE)

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:

  1. assume no liability for any reliance by any person on the information contained herein
  2. make no representations regarding the quality, accuracy or lawfulness related to the use of the ACE
  3. recommend that ACE users attend a standardized ACE training session

The ACE was developed with the support of the physicians of Ontario through a grant from the Physicians' Services Incorporated Foundation.



The ACE may be copied by any person for non-commercial use. You can download the entire ACE package here:
Aid for Capacity Evaluation (ACE) pdf link


Contact Information:

If you have any questions regarding the ACE please contact:
Dr. E. Etchells
Sunnybrook Health Sciences Centre
2075 Bayview Avenue, Room C4 10
Toronto, ON M4N 3M5
Phone: (416) 480-5996
Fax: (416) 480-5951
Email: email link


Additional Resource:

For an additional resource on capacity, please see Dr. Etchells' paper:
Bioethics for Clinicians: 3. Capacity. Canadian Medical Association Journal 1996; 155: 657-61. web link