WILLIAM L. LUYBEN, PhD, is a professor at Lehigh University. Dr. Luyben has published more than 220 technical papers in process control and design and is the author or coauthor of eleven textbooks. In addition, he has nine years of industrial experience, working with Exxon and DuPont. I-LUNG CHIEN, PhD, is a professor at National Taiwan University of Science and Technology with research interests in design and control of chemical, polymer, and bio-processes. He was a senior consulting engineer for DuPont Engineering for nine years, where he performed research and consultation for various chemical processes. Dr. Chien has published more than fifty technical papers in process control and design.