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Nowadays one key question for most organizations is which of the agile practices should be implemented to improve product quality. This systematic literature review surveys studies published up to and including 2009 and attempts to present and evaluate the empirical findings regarding quality in agile practices. The studies were classified into three groups: test driven or test first development, pair programming, and miscellaneous agile practices and methods. The findings of most studies suggest that agile practices can improve quality if they are implemented correctly. The significant findings of this study, in conjunction with previous research, could be used as guidelines for practitioners on their own settings and situations.