Steen Leleur is professor of decision support systems and planning at DTU Transport at theTechnical University of Denmark - DTU. He is an experienced transport planner, who has participated in numerous activities especially in the fields of national and international strategic transport planning studies, transport investment planning, road project appraisals and road project priority scheme studies. Steen Leleur has worked out, among other things, several textbooks such as “Road Infrastructure Planning - A Decision Oriented Approach” published in 2000 by Polyteknisk, Second Edition and “Systemic Planning – Principles and Methodology for Planning in a Complex World”, Second Edition, published in 2008 also by Polyteknisk. His most recent book is "Complex Strategic Choices – Applying Systemic Planning for Strategic Decision Making" published in 2012 by Springer in its Series in Decision Engineering. Current research interests are decision support provided by technical modelling involving complex objective functions as relate to sustainable transport planning and modfelling of risk and uncertainty in project evaluation.