Empirical Investigations of Large-Scale Regression Testing

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Regression testing is an important, but expensive part of modernsoftware development practices. Central hypotheses of the project are that several key issues have not been adequately considered in current research and that these issues can be exploited, singly and incombination, to control the regression testing process. If true, thensuccessful research will lead to cheaper, faster, more predictable andmore effective regression testing processes, thereby saving a greatdeal of time and money throughout the industry. Consequently, the project conducts the following experiments: 1. Compare different RTS techniques and to explain how features of their inputs affect their performance. 2. Measure how different application policies (rules that trigger regression testing) affect RTS performance. 3. Develop and evaluate, using the information from experiments 1 and 2, data-driven (based on each test case's prior performance)techniques for prioritizing test case execution, for determining theorder in which changes are integrated, and for pruning and optimizingthe original test suites. 4. Explore whether and how these techniques can be combined and what effect that has, and 5. Validate these models, techniques, and heuristics in an on-line, long-term study of a large software system.