Vegetables are one of the most important foods in the world. Their marketing is very complex because there are great differences among vegetables. In some cases the fruits are marketed but in other cases the products marketed are their leaves, their bulbs, their tubers, their roots, or the whole of the plant. As most vegetables are consumed fresh by people, it is absolutely necessary to ensure suf“cient quality for them. Vegetable quality should be characterized as global quality, taking into account all the characteristics of the food and according to the preferences of the consumers. The term quality implies the degree of excellence of a product or its suitability for a particular use.