Notebooks from my PhD thesis Notebooks from chapter 3: from a push-based to an open, pull-based development model Evolution of the number of contributors over time Empirical evaluation of the impact of labels and templates on pull request quality Assessment of tests with external reverse dependencies Notebook from chapter 4: impact of switching bug trackers Empirical evaluation of the switch of bug trackers Notebooks from chapter 7: package maintenance Evaluation of the prevalence of single-maintainer packages Automatic discovery of community organizations for long-term package maintenance