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This paper describes the results of a statistical analysis where the impact of design patterns on object oriented software system is experimentally evaluated. We used GoF (Gang of Four) design patterns as our assessment criteria. For empirical analysis data is collected from nine different size open source java projects. The results obtained in this experiment show how design quality of software systems can be affected by proper usage of design patterns. In this paper, we also propose an approach for measuring design quality of software using design patterns. We validate our proposed approach against quality metrics based approach.