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To date, most research on software code cloning has concentrated on detection and analysis techniques and their evaluation, and most empirical studies of cloning have investigated cloning within single system versions. In this paper, we present the results of a longitudinal study of cloning among the SCSI drivers for the Linux operating system that spans 16 years of evolution. We have chosen the SCSI driver subsystem as a test subject as it is known that cloning has been embraced by thesedoi:10.1109/scam.2011.17 dblp:conf/scam/WangG11 fatcat:xcd7jn4f7jcnlhcxgedzd7yqaq