After risk management and interest risk management in particular was primarily relevant for banks in the past, it is a crucial competition factor for all enterprises today. With increasing volatile financial markets and global competition CFOs are focusing more and more on an efficient measurement and management of interest rate risk. In this context this book aims to point out the risks of an adverse change in interest rates for a corporate portfolio of interest-bearing positions and show possibilities to measure and manage these risks. First the scene for interest risk management in a corporate treasury of a service enterprise is set by providing essential knowledge about financial risk management and giving an insight into the characteristics of a service enterprise as well as the responsibilities of a corporate treasury and the factors that influence the treasury risk management approach. This is followed by a process-oriented instruction of how to quantify interest rate risk and how to manage it. Besides the risk measures duration and convexity, two different approaches to value at risk, the historical simulation and the variance-covariance-approach, will be examined. For the management of the interest rate risk an overview of possible hedging instruments to reduce interest risk exposure will be given and their different strategies examined. All approaches will be measured against their practical feasibility and for both, the quantification and the management of interest rate risk, implications for the implementation in a service enterprise will be provided.