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• Published Subscription Review Article 28 Sep 2026

  Tracking Bus-Factor Trajectories in Popular Open-Source Packages: A Longitudinal Measurement Framework

  By Nidhi Chahal, Rajnish, Sachin

  Abstract: Maintenance concentration in a small number of contributors, commonly called the bus factor or truck factor, is a recognized risk indicator in open-source software engineering. Existing estimation methods report this quantity as a single value computed from the current state of a project's history, which does not capture how the underlying risk moves over the project's lifetime. This paper proposes measuring the bus factor repeatedly across fixed checkpoints in a …

  Published in Journal of Open Source Developments · Vol. 13, Issue 2, 2026 · pp. 45–51 Read article →