Foreword to the Special Issue in Empirical Software Engineering: Best Papers of REFSQ 2019

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Foreword to the Special Issue in Empirical Software Engineering: Best Papers of REFSQ 2019 3 ¨ Eric Knauss1 · Michael Goedicke2 · Paul Grunbacher

© Springer Science+Business Media, LLC, part of Springer Nature 2020

Welcome to this special issue that includes empirical studies in Requirements Engineering (RE). RE is a crucial factor for developing high-quality software, systems and services. RE methods, tools and processes are used to engineer systems of different scale and complexity in many domains. Collecting empirical evidence is key in RE research to determine the qualities and evaluating the maturity of the proposed RE solutions, thus fostering further research and paving the way for adoption by practitioners. The selected articles extend research presented at REFSQ ’19, the 25th International Working Conference on Requirements Engineering: Foundation for Software Quality. This 25th anniversary edition of the conference had the theme “Laying the Foundation for Speed and Flexibility in Development” and was held in Essen, Germany, from March 18 to March 21, 2019 (Knauss and Goedicke 2019). Within the high quality papers presented at the conference, five papers stood out as exceptional contributions, both to the theme and the empirical knowledge in the field. These we considered as candidates for this special issue on the best papers of REFSQ ’19. The selection of the four Technical Design papers and one Scientific Evaluation paper was based on the peer reviews from the conference, discussions with PC members, and the suitability of the work for the empirical software engineering journal. The authors of these candidate papers were invited to prepare a revised and substantially extended version, and to consider as possible extensions additional practical applications determined through case studies or experiments, additional empirical validations, systematic comparisons with other

This article belongs to the Topical Collection: Requirements Engineering for Software Quality (REFSQ)  Eric Knauss

[email protected] Michael Goedicke [email protected] Paul Gr¨unbacher [email protected] 1

Department of Computer Science and Engineering, Chalmers | University of Gothenburg, Gothenburg, Sweden

2

Paluno The Ruhr Institute for Software Technology, University of Duisburg-Essen, Essen, Germany

3

Institute Software Systems Engineering, Johannes Kepler University Linz, Linz, Austria

Empirical Software Engineering

approaches, or sound theoretical foundations. The submitted manuscripts were each peerreviewed by three reviewers. Finally, three articles could be accepted for inclusion in this special issue.

Summary of the papers This special issue proudly presents the following three papers, which together highlight a broad range of research in the field of Requirements Engineering. The first article by Florian Pudlitz, Florian Brokhausen, and Andreas Vogelsang on “What Am I Testing and Where? Comparing Testing Procedures based on Lightweight Requirements Annotations” aims to close the gap bet