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  1. Andre Cavalcante Hora. Assessing and Improving Rules to Support Software Evolution. Ph.D. thesis, University Lille 1 - Sciences et Technologies - France, November 2014. 

    Software systems evolve by adding new features, fixing bugs or refactoring existing source code. During this process, some problems may occur (e.g., backward-incompatibility, missing or unclear method deprecation) causing evolving systems and their clients to be inconsistent or to fail, decreasing code quality. As nowadays software systems are frequently part of bigger ecosystems, such problems are even harder to handle because the impact may be large and unknown.One solution to deal with such maintainability problems is the usage of rules to ensure consistency. These rules may be created by experts or extracted from source code repositories, which are commonly evaluated in small-scale case studies. We argue that existing approaches lack of: (i) a deep understanding of the benefits provided by expert-based rules, (ii) a better use of source code repositories to extract history-based rules, and (iii) a large-scale analysis of the impact of source code evolution on the actual clients.In this thesis we propose to analyze and improve rules to better support developers keeping track of source code evolution. We cover three aspects. The benefits provided by expert-based rules: we report on an investigation of rules created based on expert opinion to understand whether they are worthwhile to be adopted given the cost to produce them. The improvement of history-based rules: we propose two solutions to extract better rules from source code history. The impact of source code evolution on a software ecosystem: we undergo an investigation, in a large-scale ecosystem, on the awareness of the client systems about source code evolution.We evaluated the proposed approaches qualitatively and quantitatively in real-world case studies, and, in many cases, with the help of experts on the system under analysis. The results we obtained demonstrate the usefulness of our approaches.