A number of general technologies can contribute to increased efficiency and productivity in manufacturing. These include adjustable-speed motors, computer control of processes or major energy-using equipment, computer control of building environments, and waste heat recovery. About 54% of U.S. metalcasting industry establishments (SIC 3321 only) reported using one or more of these technologies in 1994. Most frequently cited in the industry is the use of adjustable-speed motors (about 35%). [MECS 1994]