The approach to many problems in economic analysis has changed drastically with the development and dissemination of new and more efficient computational techniques. This book presents a selection of papers illustrating the use of new computational methods and computing techniques to solve economic problems. Part 1 of the volume consists of papers which focus on modelling economic systems, presenting computational methods to investigate the evolution of behaviour of economic agents, techniques to solve complex inventory models on a parallel computer and an original approach for the construction and solution of multicriteria models involving logical conditions. Contributions to Part 2 concern new computational approaches to economic problems. These include an application of wavelets to outlier detection. New estimation algorithms are presented, one concerning seemingly related regression models, a second one on nonlinear rational expectation models and a third one dealing with switching GARCH estimation. Three contributions contain original approaches for the solution of nonlinear rational expectation models.