A number of general technologies can contribute to increased efficiency and productivity in manufacturing. These include computer control of building environment, computer control of processes or major energy-using equipment, waste heat recovery, and adjustable-speed motors. About 85% of U.S. aluminum industry establishments reported using one or more of these technologies in 1994. Most frequently cited in the aluminum industry are the use of computer control of processes or major energy-using equipment (about 66%) and the use of adjustable-speed motors (65%). [MECS 1994]