This book presents the recent developments in methodology, theory, software and implementation of Decision Support Systems. This includes: - Theory and algorithms for multiple criteria optimization with such topics dicussed, like multiple criteria optimization in hierarchical systems, relations between simulation and gaming for conflict resolution, sensitivity and trade-offs analysis in multiobjective programming. - Theory, methodology and software for decision support systems with such topics discussed like the principles of building Decision Support Systems as well as software tools for building such systems supporting certain classes of decision problems are presented. - Applications of Decision Support Systems and computer implementations of decision support systems. This includes experience in applying DSS for industry management, bank management, water system management.