  Duplicated code or code clones are a kind of code smell that have both
positive and negative impacts on the development and maintenance of software
systems. Software clone research in the past mostly focused on the detection
and analysis of code clones, while research in recent years extends to the
whole spectrum of clone management. In the last decade, three surveys appeared
in the literature, which cover the detection, analysis, and evolutionary
characteristics of code clones. This paper presents a comprehensive survey on
the state of the art in clone management, with in-depth investigation of clone
management activities (e.g., tracing, refactoring, cost-benefit analysis)
beyond the detection and analysis. This is the first survey on clone
management, where we point to the achievements so far, and reveal avenues for
further research necessary towards an integrated clone management system. We
believe that we have done a good job in surveying the area of clone management
and that this work may serve as a kind of roadmap for future research in the
area
