The thesis is analyzing the influence of two popular theories on urban strategies. The Cluster Theory established by Michael Porter and the Creative Class Theory associated with Richard Florida are both dealing with the issue of fostering economic development. They are very popular at the moment, but choose a contrary approach. While Porter is concentrating on fast productivity growth through a network of interrelated companies which might attract well educated employees in return, Florida is emphasizing the need for attracting creative people in the very first step, in order to stimulate the development. A case study shows the manifestation of the theories in urban strategies. The implementation is based on political considerations and attitude more than scientific based reasons. The theories have different supporters throughout the political scene and are transformed in reality. They are mixed with other concepts and some terms that appear in the theories are even used for recognition only, because they are fashionably. Urban strategies do not draw entirely on one theory, but use a mix of adapted concepts, even if they have a contrary approach.