On the fulfillment of coordination requirements in open-source software projects: An exploratory study

In large-scale open-source software projects, where developers are often distributed across the entire planet, coordination among developers is crucial. To estimate whether a state ofsocio-technical congruenceis achieved, which is associated with software quality and project success, we assess the alignment of collaboration and communication in such software projects in terms ofcoordination requirements. By means of an empirical study on a substantial set of large-scale open-source software projects-the development histories of all projects sum up to over 180 years-we aim at shedding light on this issue. To this end, to take a more semantic view on this phenomenon in comparison to previous work, we do not only identify coordination requirements arising from files and functions only, but also those arising from features. We found that open-source developers fulfill coordination requirements intentionally, but mostly those coordination requirements that arise from coupled source-code artifacts, while they resolve simpler ones independently. Furthermore, neither of the considered abstraction levels of source-code artifacts (files, functions, features) is more suitable to construct coordination requirements with respect to their fulfillment. This finding strongly indicates that features do not play an as important role in the development process as expected and commonly believed by the research community in the area of feature-oriented and feature-driven development. Finally, we identified notable evolutionary trends in the fulfillment of coordination requirements and showed that far-reaching social events (such as organizational issues) have a huge impact on their fulfillment, both negatively and positively. The key findings of our empirical study are that socio-technical relations are important to understand open-source development communities and that the incorporation of different abstraction levels for developer collaboration does yield important insights to further improve the evolution in open-source software projects.