City resilience as it is applied today is both a novel concept and a culmination of past knowledge and current exacerbating issues coming to a head. The expanded definition of city resilience includes disaster risk reduction in addition to city resilience as an approach to improving city function. It suggests an understanding of cities and their issues with a holistic, systems thinking perspective. This thesis evaluates ten cities from Rockefellers 100 Resilient Cities Network according to resilient urban system qualities such redundancy, modularity, diversity as the evaluation criteria (created by a review of urban and city resilience organization publications). Results indicate that those cities with long term adaptive strategies, generating significant changes tend to be more successful (according to the selected metric) than those that only generate small improvements. This thesis ends with a review of three case studies on green infrastructure as a successful strategy to achieve resilience.