We approach the issue of city theory from three perspectives, the (i) methodological perspective, (ii) the perspective of the theoretic concept, and (iii) the perspective of an explication that folds the first two perspectives together. The methodological perspective focuses on the status of theory in an area of research, where the subject “the city” is a complex entity. The second topic of the paper is the derivation of the Sema Cittã, which describes the city as an entity of intended semiosic productivity instead of conceiving it as a built entity of storages, heterotopic consumption and metabolism. The third part investigates how the concepts information, complexity and evolution can be adapted such that they can be operationalized for research, design and planning
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