7th International Workshop on Quantitative Approaches to Software Quality (QuASoQ 2019) Preface of the 7th International Workshop on Quantitative Approaches to Software Quality (QuASoQ 2019) Horst Lichter Thanwadee Sunetnanta Toni Anwar RWTH Aachen University Mahidol University Universiti Teknologi PETRONAS Germany Thailand Malaysia lichter@swc.rwth-aachen.de thanwadee.sun@mahidol.ac.th toni.anwar@utp.edu.my I. INTRODUCTION to empirically evaluate risks, efficiency or limitations of differ- th After a successful 6 QuASoQ workshop we slightly adjusted ent testing techniques in industrial settings. the list of topics for the workshop. The topics of interest included Hence, one main goal of the workshop was to exchange ex- perience, present new promising approaches and to discuss how • New approaches to measurement, evaluation, compari- to set up, organize, and maintain quantitative approaches to soft- son and improvement of software quality ware quality. • Metrics and quantitative approaches in agile projects II. WORKSHOP HISTORY • Case studies and industrial experience reports on suc- The QuASoQ workshop series has been started in 2013. Since cessful or failed application of quantitative approaches to then, it is always organized as a collocated event of the Asia- software quality Pacific Software Engineering Conference (APSEC). • Tools, infrastructure and environments supporting quan- These are the past workshop editions: titative approaches • 6th QuASoQ 2018 • Empirical studies, evaluation and comparison of meas- Nara, Japan | CEUR Vol-2273 urement techniques and models • 5th QuASoQ 2017 • Quantitative approaches to test process improvement, Nanjing, China | CEUR Vol-2017 test strategies or testability • 4th QuASoQ 2016 • Empirical evaluations or comparisons of testing tech- Hamilton, New Zealand | CEUR Vol-1771 niques in industrial settings • 3rd QuASoQ 2015 Overall, the workshop aimed at gathering together research- New Delhi, India | CEUR Vol-1519 ers and practitioners to discuss experiences in the application of state of the art approaches to measure, assess and evaluate the • 2nd QuASoQ 2014 quality of both software systems as well as software develop- Jeju, Korea | IEEE Xplore ment processes in general and software test processes in partic- ular. • 1st QuASoQ 2013 Bangkok, Thailand | IEEE Xplore As software development organizations are always forced to develop software in the "right" quality, the quality specification Since the first edition 48 papers have been presented; the aver- and quality assurance are crucial. Although there are lots of ap- age acceptance rate it ~ 75 %. proaches to deal with quantitative quality aspects, it is still chal- The following chart depicts where the authors of accepted pa- lenging to choose a suitable set of techniques that best fit to the pers come from. specific project and organizational constraints. Even though approaches, methods, and techniques are known for quite some time now, little effort has been spent on the exchange on the real-world problems with quantitative ap- proaches. For example, only limited research has been devoted Copyright © 2019 for this paper by its authors. 1 Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0). 7th International Workshop on Quantitative Approaches to Software Quality (QuASoQ 2019) • Mahen Gandhi, Amit Kumar, Yugandhar Desai, Sonali Agarwal: Studying Multifaceted Collaboration of OSS Developers and its impact on Bug Fixing Performance • Yoon Chow Yeong, Simon Hacks, Horst Lichter: Prioritization of EA Debts Facilitating Portfolio Theory We grouped the papers into three sessions and added a final round-up slot to present and discuss the major findings of our workshop. The following, we introduce the accepted papers. V. SUMMARY OF THE DISCUSSIONS About 15 researchers attended the workshop and participated in the discussions. The author-discussant model was well received by the participants and led to intensive discussions among them. The discussions show, that empirical studies and the results of experiments are of high value and lead to a deeper understanding of the subject that has been investigated. To conclude, in the course of this workshop the participants pro- posed and discussed different approaches to quantify relevant III. WORKSHOP FORMAT aspects of software development. Especially the discussions led Based on our former experience we wanted the workshop to be to new ideas, insights, and take-aways for all participants. highly interactive. In order to have an interesting and interactive event sharing lots of experience, we organized the workshop VI. ACKNOWLEDGMENTS presentations applying the author-discussant model. Many people contributed to the success of this workshop. First, we want to give thanks to the authors and presenters of the ac- Based on this workshop model, papers are presented by one cepted papers. Furthermore, we want to express our gratitude to of the authors. After the presentation, a discussant starts the dis- the APSEC 2019 organizers; they did a perfect job. cussion based on his or her pre-formulated questions. Therefore, the discussant had to prepare a set of questions and had to know Finally, we are glad that these people served on the program the details of the presented paper. The general structure of each committee (some of them for many years) and supported the talk was as follows: workshop by soliciting papers and by writing peer reviews: • The author of a paper presented the paper (20 minutes). • Ana Nicolaescu, Daimler AG, Germany • After that, the discussant of the paper opened the discus- • Wan M.N. Wan Kadir, UTM Johor Bahru, Malaysia sion using his or her questions (5 minutes). • Maria Spichkova, RMIT University, Melbourne, Aus- • Finally, we moderated the discussion among the whole tralia audience (5 minutes). • Tachanun Kangwantrakool, ISEM, Thailand IV. WORKSHOP CONTRIBUTIONS • Jinhua Li, Qingdao University, China Altogether 9 papers were submitted. Finally, these 6 papers were accepted by the program committee for presentation and publi- • Apinporn Methawachananont, NECTEC, Thailand cation covering very different topics. • Nasir Mehmood Minhas, BTH Karlskrona, Sweden • Hirohisa Aman, Sousuke Amasaki, Tomoyuki • Chayakorn Piyabunditkul, NSTDA, Thailand Yokogawa, Minoru Kawahara: Empirical Study of Fault Introduction Focusing on the Similarity among Local • Sansiri Tanachutiwat, Thai German Graduate School of Variable Names Engineering, TGGS, Thailand • Xingguang Yang, Huiqun Yu, Guisheng Fan, Kang • Hironori Washizaki, Waseda University, Japan Yang, Kai Shi: An Empirical Study on Progressive • Hongyu Zhang, University of Newcastle, Australia Sampling for Just-in-Time Software Defect Prediction • Minxue Pan, Nanjing University, China • Masayuki Doi, Yoshiki Higo, Shinji Kusumoto: A Code Clone Curation - Towards Scalable and Incremental Clone Detection - Workshop chairs, • Konrad Fögen and Horst Lichter: An Experiment to Compare Combinatorial Testing in the Presence of Horst Lichter Invalid Values Thanwadee Sunetnanta Toni Anwar Copyright © 2019 for this paper by its authors. 2 Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).