JOHN B. HUDSON is Professor of Materials Engineering in the Department of Materials Science and Engineering at the Rensselaer Polytechnic Institute, where he has taught since 1963. Dr. Hudson maintains a research program in the thermodynamics and kinetics of surface processes, and is the author of over 80 papers in this field. He is currently engaged in developing a course sequence linking freshman chemistry and materials engineering, and in applying interactive learning techniques to the teaching of engineering and science.