Matches are tentative because an applicant who is matched to a program at one point in the matching process may later be removed from the program to make room for an applicant more preferred by the program. When an applicant is removed from a previously made tentative match, an attempt is made to rematch the applicant, starting from the top of his or her list. This process is carried out for all applicants until each applicant has either been tentatively matched to the most preferred choice possible or all choices submitted by the applicant have been exhausted. When all applicants have been considered, the process is complete and all tentative matches become final.