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2007
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Do Code and Comments Co-Evolve? On the Relation between Source Code and Comment Changes

12 years 25 days ago
Do Code and Comments Co-Evolve? On the Relation between Source Code and Comment Changes
Comments are valuable especially for program understanding and maintenance, but do developers comment their code? To which extent do they add comments or adapt them when they evolve the code? We examine the question whether source code and associated comments are really changed together along the evolutionary history of a software system. In this paper, we describe an approach to map code and comments to observe their co-evolution over multiple versions. We investigated three open source systems (i.e., ArgoUML, Azureus, and JDT Core) and describe how comments and code co-evolved over time. Some of our findings show that: 1) newly added code—despite its growth rate—barely gets commented; 2) class and method declarations are commented most frequently but far less, for example, method calls; and 3) that 97% of comment changes are done in the same revision as the associated source code change.
Beat Fluri, Michael Würsch, Harald Gall
Added 04 Jun 2010
Updated 04 Jun 2010
Type Conference
Year 2007
Where WCRE
Authors Beat Fluri, Michael Würsch, Harald Gall
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