Amin Ghali is Professor Emeritus, Civil Engineering, at the University of Calgary, Canada. He is a Fellow of the Canadian Academy of Engineering, and several other institutions. He practices consulting engineering and is an active member of the American Concrete Institute committees, including ACI 435, Deflection of Concrete Building Structures. Renaud Favre is Emeritus Professor at the Federal Institute of Technology, Lausanne, Switzerland. He was formerly a Member of Council and Vice President of fédération internationale du béton (fib). Mamdouh Elbadry is Professor of Civil Engineering at the University of Calgary, Canada and a Fellow of the Canadian Society for Civil Engineering. He is a structural engineering consultant and serves on several committees of the American Concrete Institute and on the fib task group on serviceability.