How the Algorithm Works

• How does the Match algorithm work?

  The matching algorithm uses the preferences stated on the applicant Rank Order Lists, the program Rank Order Lists, and the number of available positions at each track to find the best possible outcome.

  The algorithm starts with an attempt to place an applicant into the track that is most preferred on the applicant's list. Each applicant's Rank Order List is traversed "downwards", from most preferred track to least preferred, until the first track is reached at which the applicant can be tentatively matched, or until the applicant's list of choices is exhausted. Each track accepts applicants "upwards" on its Rank Order List, continually removing less preferred matches in favor of more preferred applicants, until the track is matched to the most preferred applicants who wish to be matched to the track.

  Related Links:

  • The Matching Algorithm

• Is there a video explaining the Match Process?

  Yes, a video, examples, and an interactive demonstration are available on the Matching Algorithm page.

  Related Links:

  • The Matching Algorithm

Ranking Strategy

• What is the best strategy for ranking?

  In order to get your best possible result, you should rank your choices in order of your true preferences. Rank all applicants that you would be willing to accept. Do not rank any applicant that you would not want to be matched to your program under any circumstances.

  The algorithm is specifically designed to give each participant their best result if they rank their choices in order of true preference. Using any other strategy may cause you to get a worse result for your program. If you decide to order your preferences in another way (e.g., by how highly you think the applicant will rank your program), you may not get the best possible result for your program.

  Related Links:

  • More About Ranking Strategy
  • The Matching Algorithm

Submit Rankings

• How do I submit a Rank Order List?

  Programs must submit and certify their Rank Order Lists online in the NMS Match System by the Rank Order List deadline. The Rankings User Guide includes information on how to:

  • Add an applicant to your Rank Order List
  • Delete an applicant from your Rank Order List
  • Reorder an applicant on your Rank Order List
  • Import your Rank Order List from a file
  • Certify your Rank Order List
  • Print your Rank Order List

  Related Links:

  • Rankings User Guide
  • Information about Reversions
  • Information about Multiple Lists

• Can I change my rankings after certifying my list?

  Yes. Even if you have already certified a Rank Order List you can return at any time to make changes until the Rank Order List deadline.

  If you make changes to a list after it has been certified, you simply have to certify the list again before the deadline in order for it to be used in the Match.

  Related Links:

  • Certifying Your Rank Order List

Special Requirements

• What do I do if I have no acceptable applicants to rank?

  If a track has positions available to begin in 2024 that you would like to fill but has no acceptable applicants to rank, you should certify a Rank Order List with no ranks. In this case, the track should not be withdrawn, so that its positions can be offered in the Post-Match Process.

  Related Links:

  • Certify a Rank Order List with No Ranks

• Can I control the distribution of applicants with different characteristics that might match with my program?

  Yes. It is possible within the matching algorithm to attempt to recruit a particular distribution or "mix" of applicants based on specific applicant characteristics. To accomplish this, you use the Multiple List feature offered in the Match.

  Related Links:

  • Multiple Lists