The issue of urban development requires strategic thinking. It includes selfsustainable mechanisms, strengthening self-organization and financing of the cities, collectively. Nowadays cities face challenges in all three domains that necessitate strategic thinking on the local, national and EU levels alike. This strategic thinking has to answer the questions concerning how is it possible for a city to implement developments that might have-long term and sustainable results for the inhabitants.

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... at is the underlying logic to define, plan, implement and sustain city policy objectives? The search for the answer provides multiple evaluation methods. One of these logical frameworks is measuring the success of cities in the context of development/s related to a specific event. The success of cities is researched and measured with numerous tools and methods. Analyses in this field are becoming more common, not only on a yearly basis but even more often. The City Success Index -interpreted and presented in the current study -puts larger emphasis on involving and evaluating the so-called human factors, meanwhile creates a logical frame, which -due to the portfolio-analysis method's flexibility -is more ʻcustomizable' for a city that would like to organize a world-class or international events with strong impact, and reveals the possible opportunities and threats. The methodology is able to contribute to strategy planning or for the evaluation of the event. The applied economic model as the frame of research in the approach is new, while the utilization of the result-zone developing might offer help in decision processes of several other public policy domains.