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Impact analysis (IA) is a critical software maintenance task that identifies the effects of a given set of code changes on a larger software project with the intention of avoiding potential adverse effects. IA is a cognitively challenging task that involves reasoning about the abstract relationships between various code constructs. Given its difficulty, researchers have worked to automate IA with approaches that primarily use coupling metrics as a measure of the connectedness of different parts of a software project. Many of these coupling metrics rely on static, dynamic, or evolutionary information and are based on heuristics that tend to be brittle, require expensive execution analysis, or large histories of co-changes to accurately estimate impact sets. In this paper, we introduce a novel IA approach, called ATHENA, that combines a software system's dependence graph information with a conceptual coupling approach that uses advances in deep representation learning for code without the need for change histories and execution information. Previous IA benchmarks are small, containing less than ten software projects, and suffer from tangled commits, making it difficult to measure accurate results. Therefore, we constructed a large-scale IA benchmark, from 25 open-source software projects, that utilizes fine-grained commit information from bug fixes. On this new benchmark, our best performing approach configuration achieves an mRR, mAP, and HIT@10 score of 60.32%, 35.19%, and 81.48%, respectively. Through various ablations and qualitative analyses, we show that ATHENA's novel combination of program dependence graphs and conceptual coupling information leads it to outperform a simpler baseline by 10.34%, 9.55%, and 11.68% with statistical significance. 

The landscape of software engineering has dramatically changed in recent years. The impressive advances of artificial intelligence are just the latest and most disruptive innovation that has remarkably changed the software engineering research and practice. This special issue shares a roadmap to guide the software engineering community in this confused era. This roadmap is the outcome of a 2-day intensive discussion at the2030 Software Engineeringworkshop. The roadmap spotlights and discusses seven main landmarks in the new software engineering landscape: artificial intelligence for software engineering, human aspects of software engineering, software security, verification and validation, sustainable software engineering, automatic programming, and quantum software engineering. This editorial summarizes the core aspects discussed in the 37 papers that comprise the seven sections of the special issue and guides the interested readers throughout the issue. This roadmap is a living body that we will refine with follow-up workshops that will update the roadmap for a series of forthcoming ACM TOSEM special issues.