Two case studies of open source software development: Apache and Mozilla
ACM Transactions on Software Engineering and Methodology (TOSEM)
Reusing Open-Source Software and Practices: The Impact of Open-Source on Commercial Vendors
ICSR-7 Proceedings of the 7th International Conference on Software Reuse: Methods, Techniques, and Tools
Toward an understanding of the motivation Open Source Software developers
Proceedings of the 25th International Conference on Software Engineering
The Many Meanings of Open Source
IEEE Software
Socialization in an Open Source Software Community: A Socio-Technical Analysis
Computer Supported Cooperative Work
Seeking the source: software source code as a social and technical artifact
GROUP '05 Proceedings of the 2005 international ACM SIGGROUP conference on Supporting group work
Vizster: Visualizing Online Social Networks
INFOVIS '05 Proceedings of the Proceedings of the 2005 IEEE Symposium on Information Visualization
Proceedings of the 2006 international workshop on Mining software repositories
Group formation in large social networks: membership, growth, and evolution
Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining
Role Migration and Advancement Processes in OSSD Projects: A Comparative Case Study
ICSE '07 Proceedings of the 29th international conference on Software Engineering
On Understanding How to Introduce an Innovation to an Open Source Project
ICSEW '07 Proceedings of the 29th International Conference on Software Engineering Workshops
The convergence of social and technological networks
Communications of the ACM - Remembering Jim Gray
Latent social structure in open source projects
Proceedings of the 16th ACM SIGSOFT International Symposium on Foundations of software engineering
Characterizing key developers: a case study with apache ant
CRIWG'12 Proceedings of the 18th international conference on Collaboration and Technology
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Background: People contribute to OSS projects in wildly different degrees, from reporting a single defect once and never coming back to spending many hours each workday on the project over several years - or anything in between. It is a common conception that these degrees of participation sort the participants into a number of similar groups which are layered like the peels of an onion: The onion model. Objective: We check whether this model of gradually different degrees of participation is valid with respect to the participation in OSS project mailing-list traffic. Methods: We perform social network analysis based on replies to mailing-list messages and use visualization to check the nature of three different groups of participants. Results: There appears to be a discontinuity with respect to core members: The degree to which very active core members (as opposed to less active co-developers) react to e-mails of senders from the project's periphery is significantly higher than would be expected from their level of activity in general. Limitations: The effect might be an artifact of the assumption that each mailing-list message can be treated the same. Conclusions: We conclude that core member status may be qualitatively (rather than just quantitatively) different and the transition of individual mailing-list participants towards ever higher participation is qualitatively discontinuous.