To manufacture ice cream and frozen dairy dessert of the highest quality, it is essential to have ingredients of excellent quality, a mix that is formulated and balanced to provide proper function of each component, and excellent processing, freezing, and hardening processes. However, the selection of high-quality ingredients is, without doubt, the most important factor in successful manufacture of frozen desserts. The clean, fresh, creamy flavor desired in ice cream can be achieved only by the use of ingredients that have been carefully produced and handled and are themselves of excellent flavor quality. Frozen desserts can be made with a wide variety of ingredients, which can be grouped by category (fat sources, milk solids-not-fat sources, water sources, sweeteners, stabilizers, and emulsifiers). The functions and limitations of the components of mixes were described in Chap. 2 . This chapter will focus on the sources and selection of the mix ingredients to supply the major components.