DR. F.P.J RIMROTT studied Mechanical Engineering and Engineering Mechanics at the T.H. Karlsruhe, the University of Toronto and the Pennsylvania State University where he was a student of Professor Joseph Marin. He was conducted research in Solid Mechanics, and development work on spacecraft structures. The author of more than thirty papers in engineering research and engineering education, he has served as Chairman of the Canadian National Committee for the International Union of Theoretical and Applied Mechanics (IUTAM). He is a consultant to the aerospace industry and Professor of Mechanical engineering at the University of Toronto. DR. JOSEPH SCHWAIGHOFER studied Civil Engineering and Engineering Mechanics at the T. H. Graz and the Pennsylvania State University where he also was a student of Dr. Joseph Marin. In 1960 he held a research fellowship of the French government at the University of Nancy and from 1965 to 1966 he was a Visiting Associate Professor at North Carolina State University. Professor Schwaighofer is a consultant in model analysis to several structural firms and has conducted research in Solid State Mechanics and Photoelasticity. At present he is Associate Professor in the Department of Civil Engineering at the University of Toronto.