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A key issue in software evolution analysis is the identification of particular changes that occur across several versions of a program. We present change distilling, a tree differencing algorithm for fine-grained source code change extraction. For that, we have improved the existing algorithm by Chawathe et al. for extracting changes in hierarchically(More)
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(More)
Source code coupling and change history are two important data sources for change coupling analysis. The popularity of public open source projects in recent years makes both sources available. Based on our previous research , in this paper, we inspect different dimensions of software changes including change significance or source code dependency levels,(More)
The feature list of modern IDEs is steadily growing and mastering these tools becomes more and more demanding, especially for novice programmers. Despite their remarkable capabilities, IDEs often still cannot directly answer the questions that arise during program comprehension tasks. Instead developers have to map their questions to multiple concrete(More)
The Semantic Web provides a standardized, well-established framework to define and work with ontologies. It is especially apt for machine processing. However, researchers in the field of software evolution have not really taken advantage of that so far. In this paper, we address the potential of representing software evolution knowledge with ontologies and(More)
With the steady advances in tooling to support software engineering, mastering all the features of modern IDEs, version control systems, and project trackers is becoming increasingly difficult. Answering even the most common developer questions can be surprisingly tedious and difficult. In this article we present a user study with 35 subjects to evaluate(More)
—The Law of Demeter formulates the rule-of-thumb that modules in object-oriented program code should " only talk to their immediate friends ". While it is said to foster information hiding for object-oriented software, solid empirical evidence confirming the positive effects of following the Law of Demeter is still lacking. In this paper, we conduct an(More)
Code reviews are an effective mechanism to improve software quality, but often fall short in the development of software. To improve the desirability and ease of code reviews, we introduce an approach that explores how multi-touch interfaces can support code reviews and can make them more collaborative. Our approach provides users with features to(More)
Current version control systems are not built to be systematically analyzed. They have greatly evolved since their first appearance, but their focus has always been towards supporting developers in forward engineering activities. Supporting the analysis of the development history has so far been neglected. A plethora of third party applications have been(More)