Bill Andreopoulos. 

The major contributions of our work include adopting the NFR framework to represent and analyze two software qualities that often conflict with each other: maintainability and performance. We identified and described many heuristics that can be implemented in a system's source code to achieve either quality. We implemented some of the heuristics in two medium-sized software systems and then collected measurements to determine the effect of the heuristics on maintainability and performance. A general methodology is described for evaluating and selecting the heuristics that will improve a system’s software quality the most. The results of our research were also encoded in XML files, and made available on the World Wide Web for use by software developers

http://wer.inf.puc-rio.br/WERpapers/artigos/artigos_WER04/Bill_Andreopoulos.pdf

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