A subject in SMART-TRIAL is a person you wish to collect data from. Subjects are anyone who is the center of the data collection, it can be both a patient or a clinician. When setting up a study you have to select some subject attributes which is a variable used to identify your subject. These will be required when enrolling a new subject to a site. We do require you to select at least one mandatory and then you are allowed to select optional attributes as well.