Changes in the location of beef cutting, merchandising methods, and data availability prompted revision of the Choice Beef Prices and Spreads Series calculation procedures. Major changes include replacing carcass value at ,the wholesale level with a boxed-beef value and moving from a partially bone-in to a mostly boneless product at the retail level. A change in the method for valuing beef trimmings as an ingredient in making ground beef also affects conversion factors, prices, and spreads.