In this paper it is analyzes the role played by indeterminate or open concepts in Constitutional Law. For this purpose, it have been analyzed the constitutions of the United States, Germany, Spain and Chile, and it is made a brief review about what the legal literature has said concerning the incorporation of this class of clauses in those constitutional systems. Likewise, the paper analyzed the consequences and risks involved in the use of these concepts, and the additional problem arising from the transformation of certain and determined concepts into controversial concepts.
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