The paper presents mobility framework for Wireless Sensor Networks (WSNs), which identifies mobility issues and requirements for mobility management within the Hybrid Hierarchical Architecture (HHA) proposed by CRUISE, and provides a methodology for evaluation of mobility-management solutions including mobility classifications, mobility models and performance metrics. The proposed mobility framework is a tool for evaluation of diverse set of scenarios and applications, in terms of mobility impact and mobility-enabled functionality. The paper briefly summarises the aspects of the mobility framework and provides examples of how the proposed methodology could be applied in a logistics scenario and a road-traffic scenario. Wireless Sensor Networks, blazing the road to the Internet of the future. Dublin, Ireland, 25 April 2007.