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 \section{Materials}
+Statistics collected from gitlab issues, mailing lists and code metrics. Follow-up questionnaire with former team members to assess their learning and thoughts about the methodology.
+
+Here we should describe all the information regarding our data analysis: what questions were asked on the questionnaire and the answers; what informations where extracted from gitlab and mailing lists and how they were extracted; and what code metrics were extracted and how have we done that.
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