PROJECT AND COST CONTROL

	Contingency vs. Percent Completion in Infrastructure Projects Ali Touran and Ye Zhang
	Optimum Activity Overlapping using Genetic Algorithms Reza Dehghan, Kamran Hazini and Janaka Y. Ruwanpura
	Comparison of Residential Roofing Alternatives using Life Cycle Cost Assessment Farrukh Arif, Mehmet Emre Bayraktar and Stuart M. Grant
	Interdisciplinary Research Project: Principles of Work Scheduling D. Schlagbauer, D. Heck and P. Hofmann
	Cost and Experience based Method for Project Acceleration Osama Moselhi and Adel Alshibani