The RE4SuSy workshop series has established a strong and growing research community around the different aspects of sustainability and how to support them in requirements engineering. Since requirements define how and what a software will do, we maintain that requirements engineering is the key point in software engineering through which sustainability can be fostered. Thus, the RE4SuSy workshop series is concerned with research on techniques, tools, and processes for sustainability through requirements engineering. Last year the workshop spanned a series of application domains and the discussion centered on the challenge of growing the research community and the potential steps required to achieve growth. Two main factors identified were the potential connection to empirical investigations on scientific software and the more systematic integration into computer science and software engineering education. This edition of the RE4SuSy workshop will build on the discussions from last year, and explore further application domains as well as the local perceptions of sustainability in the hosting country. Furthermore, we will pick up the conference theme and explore tackling sustainability challenges through collective intelligence. RE4SuSy is an interactive workshop: the contributors and prospective participants engage well before the workshop date through on-line collaborative writing, discussion, and peer feedback. We foster community growth by supporting new collaborations, holding preliminary case studies, discussions, and birds-of-a-feather group work
