This book is mainly focused on the development of tools for decision-makers in finance, ranging from treasurers of firms to professional investors and bank managers. It presents a broad variety of applications using techniques and methodologies from various fields such as econometrics, operations research and financial mathematics. The tools for decision-making have been modified towards financial decision support systems. The role of the decision-maker has become dominant, both in the development and in the use of the decision support systems. The developments in both the computer hardware and software for computers simplify the design of individualized decision support systems. Financial modelling functions as a liason between theoretical financial expertise and practice.