The term coproduct is used to describe multiple items that are produced simultaneously during a production run. Coproducts are often used to increase yields in cutting operations, such as die cutting or sawing, when it is found that scrap can be reduced by combining multiple sized products in a single production run. Coproducts are also used to reduce the frequency of machine setups required in these same types of operations. Coproducts, also known as byproducts, are also common in process manufacturing such as in chemical plants. Although the concept of coproducts is fairly simple, the programming logic required to provide for planning and processing of coproducts is very complicated and most off-the-shelf manufacturing software will have problems with coproduct processing.