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It can be used either to generate or to assess the quality of test sets. In spite of being very effective in detecting faults, Mutation Testing is usually considered a high cost criterion due to: i) the large number of generated mutants; ii) the time-consuming activity of determining equivalent mutants; and iii) the mutant execution time. Many initiatives aiming at reducing the Mutation Testing application cost have been conducted, most of them addressing one of the drawbacks mentioned above.<\/jats:p><jats:p>In this paper, we identify and summarize some of the most relevant researches and results related to Mutation Testing cost reduction, e.g., Constrained-Mutation, Constraint-Based Testing and Bayesian Learning. Moreover, we propose a Mutation Testing process, named<jats:italic>Muta-Pro<\/jats:italic>, that synergetically integrates the related approaches and mechanisms. This process is intended to be incremental and tailorable to a specific application domain such as C programs or finite state machine models. The main ideas in this paper are illustrated using a UNIX utility program.<\/jats:p><jats:p>This process is being integrated in a Mutation Testing environment, based on the authors\u2019 previous experience on implementing the<jats:italic>Proteum Family<\/jats:italic>tools, aiming at promoting the technology transfer to industry and providing the basis for improving the<jats:italic>Muta-Pro<\/jats:italic>process itself.<\/jats:p>","DOI":"10.1007\/bf03192394","type":"journal-article","created":{"date-parts":[[2010,11,12]],"date-time":"2010-11-12T04:48:02Z","timestamp":1289537282000},"page":"49-61","source":"Crossref","is-referenced-by-count":10,"title":["Muta-Pro: Towards the definition of a mutation testing process"],"prefix":"10.1007","volume":"12","author":[{"given":"A. M. 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