Same Project, Different Start: How Contribution Events Shape Activity and Retention in Open Source
TLDR
This study finds open source contribution events boost newcomer retention and core contributor rates, but mentorship can lead to dependency.
Key contributions
- Event contributors are more likely to become core (12.1% vs 9.6%) and stay longer (8.2 vs 4.8 months).
- Mentorship programs foster "Steady" engagement, while other events are "Front-Loading" and organic is "Intermittent."
- "Steady" engagement predicts longer retention, but mentorship can create a dependency after program completion.
Why it matters
This paper provides the first matched-cohort study on how contribution events impact open source retention. It offers crucial insights for project maintainers and event organizers to design more effective onboarding strategies. Understanding engagement rhythms and mentor dependency can improve long-term contributor sustainability.
Original Abstract
Open source projects depend on newcomers who stay, yet most leave after a single contribution. Contribution events such as Google Summer of Code, LFX Mentorship, Hacktoberfest, and 24 Pull Requests attract thousands of newcomers each year, but whether they produce lasting contributors remains unclear. We conduct the first matched-cohort study comparing 2,001 event-based and 2,001 organic contributors across 330 projects. Our results reveal three key findings. First, event contributors have significantly higher odds of becoming core contributors (12.1% vs. 9.6%, p < 0.001, OR = 1.31) and stay significantly longer (median 8.2 vs. 4.8 months). Second, each entry mechanism is associated with a fundamentally different engagement rhythm: 68.9% of mentorship contributors sustain Steady weekly activity across their first 12 weeks, whereas 61.0% of non-mentorship contributors exhibit Front-Loading and 57.0% of organic contributors exhibit Intermittent engagement (p < 0.001). Third, Steady engagement is associated with significantly longer retention regardless of group (median 13 vs. 8 months for Front-Loading), yet mentorship contributors who lose their program scaffolding show shorter retention than self-sustained non-mentorship contributors, revealing a mentor-dependency effect. A newcomer's first 12 weeks are strongly indicative of their long-term trajectory.
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