Riser design deals with the development of suitable reservoirs of feed metal in addition to the desired casting shape. The role of an engineer in designing risers can be stated simply as making sure that risers will provide the feed metal: in the right amount, at the right place, and at the right time. This article addresses these considerations in the context of feed metal volume, riser location, and duration of liquid feed metal. It discusses the three types of feeding systems, such as riser sleeves, topping compounds, and breaker cores, that are used in riser design. The factors in riser size, riser necks, and breaker cores are discussed.