A method of identifying a particular mask for a patient for use in delivering a flow of breathing gas to the patient includes capturing with a visual presentation and interaction component a plurality of images of the patient; receiving with the visual presentation and interaction component a number of responses from the patient to questions presented to the patient, eliminating one or more masks from a pool of potential masks for the patent based on at least one of the responses, utilizing at least some images of the plurality of images to determine the particular mask for the patient from the pool of potential masks, and identifying the particular mask to the patient.