Editorial

Funding

A special word of thanks is due to everyone who made REFSQ 2021 possible. This includes all the authors of the submitted papers, the PC members and external reviewers, the keynote speakers, the chair of each track, sponsors, the REFSQ 2021 participants, the steering committee, and the organization team in Essen. For this special issue, we would like to thank the authors for their excellent work in extending their original papers with novel, fascinating contributions. We thank the reviewers of this Special Issue, a subset of the REFSQ 2021 program committee, for their high-quality reviews in the whole reviewing process. Finally, we would like to thank Peri Loucopoulos, the Editor-in-Chief of the Requirements Engineering journal, and the editorial assistants for their support.