A method of facilitating delivery of a discretionary dose of insulin to a user includes: enabling the user or a caregiver to specify, via a computer-based user interface, parameters associated with a discretionary delivery of insulin that may be delivered to the user； subsequently receiving data that represents the user's glucose level during a period of time associated with the discretionary delivery； automatically determining, with a computer-based processor, based on the received data, if, when and how much discretionary insulin should be delivered to the user during the period of time associated with the discretionary delivery； delivering insulin to the user during the period of time associated with the discretionary delivery according to the automatic determination； and delivering insulin to the user with the insulin delivery device according to a non-discretionary insulin delivery schedule unless a discretionary insulin delivery mode has been triggered.
