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CASS (Coding Accuracy Support System) enables the United States Postal Service to evaluate the accuracy of software that cleans and matches addresses. CASS Certification improves the accuracy of ZIP+4, carrier route, and five-digit coding accuracy, thereby saving the sender money in printing and mailing.

For software vendors and service bureaus, CASS Certification must be renewed annually with the USPS to meet current CASS Certification cycle requirements.

CASS Certified products are listed in USPS literature and on its web site. CASS software will correct and standardize addresses. It will also add missing address information, such as ZIP Codes, cities, and states, to ensure the address is complete. Starting with 2007 Cycle L, CASS software will also perform Delivery Point Validation to verify whether or not an address is a deliverable address and access the USPS Locatable Address Conversion System to update addresses that have been renamed or renumbered. Cycle L also requires that the address be confirmed with the Delivery Point Validation before adding a +4 Code to the ZIP Code.

A correct address in turn saves the Postal Service time, money and man-power by reducing the volume of:

1. non-deliverable mail;
2. unsorted mail;
3. mail that is deliverable, but requires extra effort to determine the proper location to deliver it to.

The street and city name misspellings are corrected; street suffix, zip code and zip4 add-on are added; and, in this case, the address is determined to be the location of a business or residential customer.

In addition to an updated address, CASS software can also return descriptive information about the address. The information falls into two categories:

1. If the address was successfully processed or if not then why.
2. Information on how to deliver the mailing.