Grades are based on nationally uniform standards developed by Dairy Programs' experts in cooperation with industry representatives. Sellers can request grading services to assure that products meet specific grade or contract requirements and have good keeping quality properties. Buyers can request grading services to assure that products have uniform high quality. Those wishing to use the services must request them, qualify for them, and pay a fee commensurate with the cost of providing them. Two examples of such services are the grade label program for butter and Cheddar cheese, and the acceptance service for volume buyers. Under the grade label program, consumer packages bear an official identification indicating the U.S. grade. As a part of the acceptance service, the user has all deliveries examined by USDA to certify that they meet specifications.