Considering the current underutilization of radio frequency spectrum for wireless communication, the Cognitive Radio is seen as a key concept to enable the improvement of the radio frequency spectrum utilization. The implementation of cognitive radio devices must be based on the four main cognitive functions: spectrum sensing, spectrum decision, spectrum sharing, and spectrum mobility. However, cognitive radio networks should be managed to guaranty the proper operation of the cognitive radio devices. This management should improve the administrator knowledge about the cognitive radio network operation. Therefore, the configuration, monitoring, and visualization of the cognitive functions are fundamental to the continuous knowledge building process of the network administrator. In this book, we propose Kitsune, a management system based on a hierarchical model allowing to manage summarized information about cognitive functions in radio networks. Kitsune is designed to manage all four cognitive functions, enabling the network administrator to configure the cognitive radio devices, monitor the results of each cognitive function, and make important visualizations of these results.