Redefinitions refer to the process in which products are reassigned from producing industries in which they are secondary, to the industries where those products are primary.  Redefinition is part of the “two-step” process to reassign secondary products from the industry in which they were produced to the industries these products are primary products.  For more information about redefinitions and the treatment of secondary products in BEA’s input-output accounts, see “MEASURING THE NATION’S ECONOMY: AN INDUSTRY PERSPECTIVE, A Primer on BEA’s Industry Accounts” (Revised May 2011), at