Universal Sorting System (USS) – July 12, 2019

The enclosed 'Mail Processing Work Assignment Guidelines;" provide primary craft designations relative to the performance of specific mail processing work functions. Compliance with the principles contained therein is mandatory and applicable to the assignment of all categories of employees in the regular work force. These assignment guidelines are to be implemented at all postal installations which perform mail processing, in accordance with the implementation criteria outlined below and consistent with the terms of the 1978 National Agreement.