Evaluating Answer Quality/Efficiency Tradeoffs. Ugur Cetintemel, Bjorn T. Jonsson, Michael J. Franklin, C. Lee Giles and Divesh Srivastava. For many emerging applications and environments, information systems designers and implementers must consider the tradeoffs between efficiency and the quality of query answers. This flexibility, while allowing numerous opportunities for optimization, complicates the development of various system components and their performance evaluation. In this short paper, we first outline the issues that arise in evaluating answer quality/efficiency tradeoffs. We then describe how we address these issues in two ongoing projects that adopt notions of answer quality from the field of Information Retrieval.