Release engineering deals with all activities inbetween regular development and actual usage of asoftware product by the end user, i.e., integration, build, testexecution, packaging and delivery of software. Although re-search on this topic goes back for decades, the increasing heterogeneity and variability of software products along withthe recent trend to reduce the release cycle to days or even hoursstarts to question some of the common beliefs and practicesof the field. For example, a project like Mozilla Firefox releasesevery 6 weeks, generating updates for dozens of existing Fire-fox versions on 5 desktop, 2 mobile and 3 mobile desktopplatforms, each of which for more than 80 locales. In this con-text, the International Workshop on Release Engineering(RELENG) aims to provide a highly interactive forum for re-searchers and practitioners to address the challenges of, findsolutions for and share experiences with release engineering, and to build connections between the various communities.

Release engineering deals with all activities in between regular development and actual usage of a software product by the end user, i.e., integration, build, test execution, packaging and delivery of software. Although research on this topic goes back for decades, the increasing heterogeneity and variability of software products along with the recent trend to reduce the release cycle to days or even hours starts to question some of the common beliefs and practices of the field. For example, a project like Mozilla Firefox releases every 6 weeks, generating updates for dozens of existing Firefox versions on 5 desktop, 2 mobile and 3 mobile desktop platforms, each of which for more than 80 locales. In this context, the International Workshop on Release Engineering (RELENG) aims to provide a highly interactive forum for researchers and practitioners to address the challenges of, find solutions for and share experiences with release engineering, and to build connections between the various communities.