1. The influence of properties of open source projects on its popularity with developers Marijn de Graaf

2. Popularity measures Number of contributors Number of commits Commits per contributor

3. Project measures License Programming language (compare with language popularities) (Quality) metrics Comment percentage (Many more) Size (LOC, mediating variable) …

4. Plans First: many projects, few metrics (statistical significance, available metrics) Second: less projects, more metrics Cause or effect: which increases first, metric or popularity?