A method and system for performing master planning priority assignment is presented. The method includes assigning a priority to a demand record that contains at least one demand attribute and a priority field. The assignment includes identifying a database that contains priority assignment rules for demand records and then querying the rule database to find the database record that corresponds to the particular demand record. The corresponding database record is found by matching the data in the attribute fields in the rule database and the demand record. The priority associated with the matching priority database record is assigned to the demand record. Additional embodiments include a system and storage medium for performing master planning priority assignment.