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Additional Information

Competing Interests

Arie van Deursen serves as Academic Editor for PeerJ Computer Science.

Marco di Biase and Magiel Bruntink are employed by Software Improvement Group, respectively as Researcher and Head of Research.

Author Contributions

Marco di Biase conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, performed the computation work, authored or reviewed drafts of the paper, approved the final draft.

Magiel Bruntink conceived and designed the experiments, authored or reviewed drafts of the paper, approved the final draft.

Arie van Deursen conceived and designed the experiments, authored or reviewed drafts of the paper, approved the final draft.

Alberto Bacchelli conceived and designed the experiments, authored or reviewed drafts of the paper, approved the final draft.

Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

The Human Subjects Committee of the Faculty of Economics, Business Administration and Information Technology at the University of Zurich authorizes the research described in Mr. Alberto Bacchelli’s research proposal with IRB 2018-024.

Data Deposition

The following information was supplied regarding data availability:

The Effects of Change Decomposition on Code Review - A Controlled Experiment - Online appendix

URL: https://data.4tu.nl/repository/uuid:826f7051-35f6-4696-b648-8e56d3ea5931

Funding

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 642954. Bacchelli has received support from the Swiss National Science Foundation through the SNF Project No. PP00P2_170529. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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