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Code smells are characteristics of the software that may indicate a code or design problem that can make software hard to understand, to evolve and maintain. Detecting code smells in the code and consequently applying the right refactoring steps, when necessary, is very important for improving the quality of the code. In this paper, according to well known metrics proposed to evaluate the code and design quality of a system, we analyze the impact of refactoring, applied to remove code smells, on the quality evaluation of the system. [ABSTRACT FROM AUTHOR]