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Libre (free / open source) software is a good example of global software development. Thousands of projects, in a wide range of domains which involve hundreds of thousands of developers and contributors from all around the world. Some large (both in size and developer community) libre software projects have shown evidence of producing code with complete functionality and fast evolution (with linear or superlinear growth), while maintaining low defect density. Many companies are exploring how to benefit from this situation, considering several approaches related to libre software development. For instance, some of them have hired full-time developers, focusing their work on some libre software projects they consider strategic.However, before joining the core development team of the project, these hired developers have to follow a process of software comprehension, and get used to the rules and …