The quality of a commodity depends greatly on the intended use. As this entry deals with quality of agricul- tural products (see Agrophysical Objects (Soils, Plants, Agricultural Products, and Foods)), it seems reasonable to start by identifying what commodities are included in the term agricultural product, and what their possible uses are. The United States Department of Agriculture (USDA) points out that agricultural products, sometimes also referred to as “food and fiber” products, cover a broad range of goods; specifically, all of the products found in Chapters 1–24 of the U.S. Harmonized Tariff Schedule – except for fishery products, manufacture