The importance of different aspects of quality depend upon the grain’s intended use. Viability of feed grain is immaterial, unlike its nutritional value and freedom from toxic substances. Seed grain should have a high viability, give vigorous seedlings and be free of grains of other varieties, or species (Chapter 9). However, the rate of seed germination is usually not critical. Seed grain is normally dressed with toxic chemicals to control pathogens. Malting barley has a preferred chemical composition, should be adequately uniform, must germinate rapidly and evenly and should not contain poisonous materials (Chapter 15). For grain which is to be put into store the moisture content, temperature, and freedom from pests are of immediate importance (Chapter 10). In some situations agreed, or legally defined, tests of quality are applied to grain intended for particular purposes. The tests used often differ between countries, and even between different groups of users in one country. Yet others tests are employed as aids by grain users for their own purposes, and not as a basis for commercial transactions.