The volume of data archived in open source software project repositories makes automated, quantitative techniques attractive for extracting and analyzing information from these archives. However, many kinds of archival data include blocks of natural language text that are difficult to analyze automatically.This paper introduces a qualitative analysis method that is transparent and repeatable, leads to objective findings when dealing with qualitative data, and is efficient enough to be applied to large archives.The method was applied in a case study of developer and user forum discussions of an open source electronic medical record project. The study demonstrates that the qualitative repository mining method can be employed to derive useful results quickly yet accurately. These results would not be possible using a strictly automated approach.