@article {Kazuhiro Yamashita2016, title = {Magnet or Sticky? Measuring Project Characteristics from the Perspective of Developer Attraction and Retention}, journal = {Journal of Information Processing}, volume = {24}, number = {2}, year = {2016}, pages = {339-348}, abstract = {Open Source Software (OSS) is vital to both end users and enterprises. As OSS systems are becoming a type of infrastructure, long-term OSS projects are desired. For the survival of OSS projects, the projects need to not only retain existing developers, but also attract new developers to grow. To better understand how projects retain and attract contributors, our preliminary study aimed to measure the personnel attraction and retention of OSS projects using a pair of population migration metrics, called Magnet (personnel attraction) and Sticky (retention) metrics. Because the preliminary study analyzed only 90 projects and the 90 projects are not representative of GitHub, this paper extend the preliminary study to better understand the generalizability of the results by analyzing 16, 552 projects of GitHub. Furthermore, we also add a pilot study to investigate the typical duration between releases to find more appropriate release duration. The study results show that (1) approximately 23\% of developers remain in the same projects that the developers contribute to, (2) the larger projects are likely to attract and retain more developers, (3) 53\% of terminal projects eventually decay to a state of fewer than ten developers and (4) 55\% of attractive projects remain in an attractive category. }, keywords = {github, retention}, doi = {10.2197/ipsjjip.24.339}, url = {https://www.jstage.jst.go.jp/article/ipsjjip/24/2/24_339/_article}, author = {Yamashita, Kazuhiro and Kamei, Yasutaka and McIntosh, Shane and Hassan, Ahmed E. and Ubayashi, Naoyasu} } @conference {Yamashita:2014:MSO:2597073.2597116, title = {Magnet or Sticky? An OSS Project-by-project Typology}, booktitle = {Proceedings of the 11th Working Conference on Mining Software Repositories}, series = {MSR 2014}, year = {2014}, pages = {344{\textendash}347}, publisher = {ACM}, organization = {ACM}, address = {New York, NY, USA}, abstract = {For Open Source Software (OSS) projects, retaining existing contributors and attracting new ones is a major concern. In this paper, we expand and adapt a pair of population migration metrics to analyze migration trends in a collection of open source projects. Namely, we study: (1) project stickiness, i.e., its tendency to retain existing contributors and (2) project magnetism, i.e., its tendency to attract new contributors. Using quadrant plots, we classify projects as attractive (highly magnetic and sticky), stagnant (highly sticky, weakly magnetic), fluctuating (highly magnetic, weakly sticky), or terminal (weakly magnetic and sticky). Through analysis of the MSR challenge dataset, we find that: (1) quadrant plots can effectively identify at-risk projects, (2) stickiness is often motivated by professional activity and (3) transitions among quadrants as a project ages often coincides with interesting events in the evolution history of a project. }, keywords = {Developer migration, Magnet, mining challenge, msr challenge, open source, Sticky}, isbn = {978-1-4503-2863-0}, doi = {10.1145/2597073.2597116}, url = {http://doi.acm.org/10.1145/2597073.2597116}, attachments = {https://flosshub.org/sites/flosshub.org/files/yamashita.pdf}, author = {Yamashita, Kazuhiro and McIntosh, Shane and Kamei, Yasutaka and Ubayashi, Naoyasu} } @conference {534, title = {Analysis of Coordination Between Developers and Users in the Apache Community}, booktitle = {OSS2008: Open Source Development, Communities and Quality (IFIP 2.13)}, series = {IFIP International Federation for Information Processing}, volume = {275/2008}, year = {2008}, month = {2008///}, pages = {81 - 92}, publisher = {Springer}, organization = {Springer}, chapter = {7}, abstract = {Coordination is one of the keys for the success of open source software (OSS) communities because geographically distributed members need to collaborate on their work using communication tools (e.g., mailing lists, bulletin board systems, bug tracking systems, and so on). In this paper, we investigated the informal social structure among developers and users by analyzing two mailing lists of developers and users in the Apache community based on betweenness centrality, one centrality measure proposed by Freeman. From the analysis results, we found that (1) participants with high betweenness coordinated activities between developers and users and (2) some participants have been functioning as coordinators in the community for a long time. }, keywords = {apache, email, mailing list}, issn = {978-0-387-09683-4}, doi = {http://dx.doi.org/10.1007/978-0-387-09684-1_7}, attachments = {https://flosshub.org/sites/flosshub.org/files/Analysis\%20of\%20Coordination.pdf}, author = {Kamei, Yasutaka and Matsumoto, Shinsuke and Maeshima, Hirotaka and Onishi, Yoji and Ohira, Masao and Matsumoto, Ken-ichi} } @conference {Tsunoda:2006:AOD:1137983.1138031, title = {Analyzing OSS developers{\textquoteright} working time using mailing lists archives}, booktitle = {Proceedings of the 2006 international workshop on Mining software repositories}, series = {MSR {\textquoteright}06}, year = {2006}, pages = {181{\textendash}182}, publisher = {ACM}, organization = {ACM}, address = {New York, NY, USA}, abstract = {Our mining question is {\textquotedblleft}when OSS developers work?{\textquotedblright} OSS developers{\textquoteright} working time may be a good indicator to understand the development style of a project. (For example, if many developers work in office hour, these might be daily works in a company.)}, keywords = {developers, email, email archives, mailing lists, mining challenge, msr challenge, overtime work, postgresql, workload}, isbn = {1-59593-397-2}, doi = {http://doi.acm.org/10.1145/1137983.1138031}, url = {http://doi.acm.org/10.1145/1137983.1138031}, attachments = {https://flosshub.org/sites/flosshub.org/files/181AnalyzingOSS.pdf}, author = {Tsunoda, Masateru and Monden, Akito and Kakimoto, Takeshi and Kamei, Yasutaka and Matsumoto, Ken-ichi} } @conference {Kakimoto:2006:USB:1137983.1138026, title = {Using software birthmarks to identify similar classes and major functionalities}, booktitle = {Proceedings of the 2006 international workshop on Mining software repositories}, series = {MSR {\textquoteright}06}, year = {2006}, pages = {171{\textendash}172}, publisher = {ACM}, organization = {ACM}, address = {New York, NY, USA}, keywords = {argouml, class, file, mining challenge, msr challenge, multi-dimensional scaling, similarity, software birthmark, source code}, isbn = {1-59593-397-2}, doi = {http://doi.acm.org/10.1145/1137983.1138026}, url = {http://doi.acm.org/10.1145/1137983.1138026}, attachments = {https://flosshub.org/sites/flosshub.org/files/171UsingSoftware.pdf}, author = {Kakimoto, Takeshi and Monden, Akito and Kamei, Yasutaka and Tamada, Haruaki and Tsunoda, Masateru and Matsumoto, Ken-ichi} }